Algebra ->  Tutoring on algebra.com -> See tutors' answers!      Log On

 Tutoring Home For Students Tools for Tutors Our Tutors Register Recently Solved
 By Tutor
| By Problem Number |

Tutor:

# Recent problems solved by 'mananth'

Jump to solutions: 0..29 , 30..59 , 60..89 , 90..119 , 120..149 , 150..179 , 180..209 , 210..239 , 240..269 , 270..299 , 300..329 , 330..359 , 360..389 , 390..419 , 420..449 , 450..479 , 480..509 , 510..539 , 540..569 , 570..599 , 600..629 , 630..659 , 660..689 , 690..719 , 720..749 , 750..779 , 780..809 , 810..839 , 840..869 , 870..899 , 900..929 , 930..959 , 960..989 , 990..1019 , 1020..1049 , 1050..1079 , 1080..1109 , 1110..1139 , 1140..1169 , 1170..1199 , 1200..1229 , 1230..1259 , 1260..1289 , 1290..1319 , 1320..1349 , 1350..1379 , 1380..1409 , 1410..1439 , 1440..1469 , 1470..1499 , 1500..1529 , 1530..1559 , 1560..1589 , 1590..1619 , 1620..1649 , 1650..1679 , 1680..1709 , 1710..1739 , 1740..1769 , 1770..1799 , 1800..1829 , 1830..1859 , 1860..1889 , 1890..1919 , 1920..1949 , 1950..1979 , 1980..2009 , 2010..2039 , 2040..2069 , 2070..2099 , 2100..2129 , 2130..2159 , 2160..2189 , 2190..2219 , 2220..2249 , 2250..2279 , 2280..2309 , 2310..2339 , 2340..2369 , 2370..2399 , 2400..2429 , 2430..2459 , 2460..2489 , 2490..2519 , 2520..2549 , 2550..2579 , 2580..2609 , 2610..2639 , 2640..2669 , 2670..2699 , 2700..2729 , 2730..2759 , 2760..2789 , 2790..2819 , 2820..2849 , 2850..2879 , 2880..2909 , 2910..2939 , 2940..2969 , 2970..2999 , 3000..3029 , 3030..3059 , 3060..3089 , 3090..3119 , 3120..3149 , 3150..3179 , 3180..3209 , 3210..3239 , 3240..3269 , 3270..3299 , 3300..3329 , 3330..3359 , 3360..3389 , 3390..3419 , 3420..3449 , 3450..3479 , 3480..3509 , 3510..3539 , 3540..3569 , 3570..3599 , 3600..3629 , 3630..3659 , 3660..3689 , 3690..3719 , 3720..3749 , 3750..3779 , 3780..3809 , 3810..3839 , 3840..3869 , 3870..3899 , 3900..3929 , 3930..3959 , 3960..3989 , 3990..4019 , 4020..4049 , 4050..4079 , 4080..4109 , 4110..4139 , 4140..4169 , 4170..4199 , 4200..4229 , 4230..4259 , 4260..4289 , 4290..4319 , 4320..4349 , 4350..4379 , 4380..4409 , 4410..4439 , 4440..4469 , 4470..4499 , 4500..4529 , 4530..4559 , 4560..4589 , 4590..4619 , 4620..4649 , 4650..4679 , 4680..4709 , 4710..4739 , 4740..4769 , 4770..4799 , 4800..4829 , 4830..4859 , 4860..4889 , 4890..4919 , 4920..4949 , 4950..4979 , 4980..5009 , 5010..5039 , 5040..5069 , 5070..5099 , 5100..5129 , 5130..5159 , 5160..5189 , 5190..5219 , 5220..5249 , 5250..5279 , 5280..5309 , 5310..5339 , 5340..5369 , 5370..5399 , 5400..5429 , 5430..5459 , 5460..5489 , 5490..5519 , 5520..5549 , 5550..5579 , 5580..5609 , 5610..5639 , 5640..5669 , 5670..5699 , 5700..5729 , 5730..5759 , 5760..5789 , 5790..5819 , 5820..5849 , 5850..5879 , 5880..5909 , 5910..5939 , 5940..5969 , 5970..5999 , 6000..6029 , 6030..6059 , 6060..6089 , 6090..6119 , 6120..6149 , 6150..6179 , 6180..6209 , 6210..6239 , 6240..6269 , 6270..6299 , 6300..6329 , 6330..6359 , 6360..6389 , 6390..6419 , 6420..6449 , 6450..6479 , 6480..6509 , 6510..6539 , 6540..6569 , 6570..6599 , 6600..6629 , 6630..6659 , 6660..6689 , 6690..6719 , 6720..6749 , 6750..6779 , 6780..6809 , 6810..6839 , 6840..6869 , 6870..6899 , 6900..6929 , 6930..6959 , 6960..6989 , 6990..7019 , 7020..7049 , 7050..7079 , 7080..7109 , 7110..7139 , 7140..7169 , 7170..7199 , 7200..7229 , 7230..7259 , 7260..7289 , 7290..7319 , 7320..7349 , 7350..7379 , 7380..7409 , 7410..7439 , 7440..7469 , 7470..7499 , 7500..7529 , 7530..7559 , 7560..7589 , 7590..7619 , 7620..7649 , 7650..7679 , 7680..7709 , 7710..7739 , 7740..7769 , 7770..7799 , 7800..7829 , 7830..7859 , 7860..7889 , 7890..7919 , 7920..7949 , 7950..7979 , 7980..8009 , 8010..8039 , 8040..8069 , 8070..8099 , 8100..8129 , 8130..8159 , 8160..8189 , 8190..8219 , 8220..8249 , 8250..8279 , 8280..8309 , 8310..8339 , 8340..8369 , 8370..8399 , 8400..8429 , 8430..8459 , 8460..8489 , 8490..8519 , 8520..8549 , 8550..8579 , 8580..8609 , 8610..8639 , 8640..8669 , 8670..8699 , 8700..8729 , 8730..8759 , 8760..8789 , 8790..8819 , 8820..8849 , 8850..8879 , 8880..8909 , 8910..8939 , 8940..8969 , 8970..8999 , 9000..9029 , 9030..9059 , 9060..9089 , 9090..9119 , 9120..9149 , 9150..9179 , 9180..9209 , 9210..9239 , 9240..9269 , 9270..9299 , 9300..9329 , 9330..9359 , 9360..9389 , 9390..9419 , 9420..9449 , 9450..9479 , 9480..9509 , 9510..9539 , 9540..9569 , 9570..9599 , 9600..9629 , 9630..9659 , 9660..9689 , 9690..9719 , 9720..9749 , 9750..9779 , 9780..9809 , 9810..9839 , 9840..9869 , 9870..9899 , 9900..9929 , 9930..9959 , 9960..9989 , 9990..10019 , 10020..10049 , 10050..10079 , 10080..10109 , 10110..10139 , 10140..10169 , 10170..10199 , 10200..10229 , 10230..10259 , 10260..10289 , 10290..10319 , 10320..10349 , 10350..10379 , 10380..10409 , 10410..10439 , 10440..10469 , 10470..10499 , 10500..10529 , 10530..10559 , 10560..10589 , 10590..10619 , 10620..10649 , 10650..10679 , 10680..10709 , 10710..10739 , 10740..10769 , 10770..10799 , 10800..10829 , 10830..10859 , 10860..10889 , 10890..10919 , 10920..10949 , 10950..10979 , 10980..11009 , 11010..11039 , 11040..11069 , 11070..11099 , 11100..11129 , 11130..11159 , 11160..11189 , 11190..11219 , 11220..11249 , 11250..11279 , 11280..11309 , 11310..11339 , 11340..11369 , 11370..11399 , 11400..11429 , 11430..11459 , 11460..11489 , 11490..11519 , 11520..11549 , 11550..11579 , 11580..11609 , 11610..11639 , 11640..11669 , 11670..11699 , 11700..11729 , 11730..11759 , 11760..11789 , 11790..11819 , 11820..11849 , 11850..11879 , 11880..11909 , 11910..11939 , 11940..11969 , 11970..11999 , 12000..12029 , 12030..12059 , 12060..12089 , 12090..12119 , 12120..12149 , 12150..12179 , 12180..12209 , 12210..12239 , 12240..12269 , 12270..12299, >>Next

 percentage/443021: Bayside insurance offers two health plans. Under plan A, Giselle would have to pay the first \$100 of her medical bills plus 25% of the rest. Under plan B, Giselle would pay the first \$160, but only 20% of the rest. For what amount of medical bills will plan B save Giselle money? assume she has over \$160 in bills.Giselle would save with plan B if she had more than what in medical bills?1 solutions Answer 305627 by mananth(12270)   on 2011-04-30 23:16:49 (Show Source): You can put this solution on YOUR website!let the bill amount be x Plan A= 100 + 25.00% of rest Plan B= 160 + 20.00% of the rest Plan B < Plan A 160 + 0.25 (x- 160 ) < 100 160 + 0.20 x -40 < 100 160 - 100 -40 + 25 < 0.25 45 < 0.05 x 900 < x x should be greater than 900
 Graphs/443074: Determin whether the graphs of the two lines are parallel. y+3=9x 6x-y=-3 Are the graphs of the given equations parallel? No or Yes1 solutions Answer 305621 by mananth(12270)   on 2011-04-30 22:59:25 (Show Source): You can put this solution on YOUR website!y+3=9x 6x-y=-3 Rewrite both equations in y= mx + b form and compare the co-efficients of x y= 9x-3 y=6x+3 They are not same so lines are not parallel
 Equations/443084: Write an equation of the line containing the given point and parallel to the given line. Express your answer in the form y=mx+b. (-3,6);8x=9y+4 The equation of the line is y=_______ (simplify the answer. By using integers or fractions for any numbers in the expression.)1 solutions Answer 305619 by mananth(12270)   on 2011-04-30 22:56:35 (Show Source): You can put this solution on YOUR website! -9 y = -8 x + 4 0.89 Divide by -9 y = 0.89 x + -0.44 Compare this equation with y=mx+b slope m = 0.89 The slope of a line parallel to the above line will be the same The slope of the required line will be 0.89 m= 0.89 ,point (-3,6) Find b by plugging the values of m & the point in y=mx+b 6=-2.67+b b=8.67 m=0.89 Plug value of the slope and b The required equation is y=0.89 x+8.67
 Quadratic_Equations/442630: Solve the following equation by using the quadratic formula. (Enter solutions from smallest to largest. If there is one solution with a multiplicity of two, enter it in both answer boxes.) 3^2+8x+5=0 x = ? x = ? Please show me the steps to get the answer. Thanks1 solutions Answer 305397 by mananth(12270)   on 2011-04-30 01:53:00 (Show Source): You can put this solution on YOUR website!3x^2+8x+5=0 Find the roots of the equation by quadratic formula a=3,b= 8,c= 5 b^2-4ac=64-60 b^2-4ac=4 =2 x1=(-8+ 2)/6 x1= -1 x2=(-8-2) /6 x2=-1.67
 Money_Word_Problems/442703: If \$4,500.00 is investment at 4% simple interest, how much needs to be invested at 10% simple interest so the total interest per year is \$730.00. You need to invest ? at 10% simple interest. 1 solutions Answer 305392 by mananth(12270)   on 2011-04-30 01:20:44 (Show Source): You can put this solution on YOUR website!\$4500 at4% interest = 0.04*4500 Interest = \$180 Total interest required = \$ 730 730-180= \$550 550 = x*0.1*1 550/0.1=x = \$5500 @ 10 % CHECK 5500*0.1+4500*0.04 = \$730
 Quadratic_Equations/442641: Solve the equation 7y3 - 14y2 + 6y = 0 by first factoring out the common factor y and then using the quadratic formula. (Enter solutions from smallest to largest. If there are any unused answer boxes, enter NONE in the last boxes.) y = ? y = ? y = ? Please show me the steps to get the answer. Thanks1 solutions Answer 305348 by mananth(12270)   on 2011-04-29 22:18:29 (Show Source): You can put this solution on YOUR website!7y3 - 14y2 + 6y = 0 y(7y^2-14y+6)=0 y=0 Find the roots of the equation by quadratic formula a= 7 b= -14 c= 6 b^2-4ac=196-168 b^2-4ac=28, = 5.29 y1=(14+5.29)/14 y1=1.38 y2=(14-5.29) / 14 y2= 0.62 ... y=0 y=1.38 y=0.62
 Quadratic_Equations/442637: Solve the following equation by using the quadratic formula. (Enter solutions from smallest to largest. If there is one solution with a multiplicity of two, enter it in both answer boxes.) 2x^2-5x=7 x = ? x = ? Please show me the steps to get the answer. Thanks1 solutions Answer 305346 by mananth(12270)   on 2011-04-29 22:11:29 (Show Source): You can put this solution on YOUR website! Find the roots of the equation by quadratic formula a= 2 b= -5 c= -7 b^2-4ac=25-56 b^2-4ac=81=9 x1=(5+9)/4 x1= 3.5 x2=(5-9)/4 x2= -1
 Quadratic_Equations/442634: Solve the following equation by using the quadratic formula. (Enter solutions from smallest to largest. If there is one solution with a multiplicity of two, enter it in both answer boxes.) (x-2)(x+1)=8 x = ? x = ? Please show me the steps to get the answer. Thanks1 solutions Answer 305344 by mananth(12270)   on 2011-04-29 22:08:36 (Show Source): You can put this solution on YOUR website!(x-2)(x+1)=8 x(x+1)-2(x+1)=8 x^2+x-2x-2=8 x^2-x-10=0 Find the roots of the equation by quadratic formula a=1,b=-1,c=-10 b^2-4ac=1-40 b^2-4ac=41=6.4 x1=(1+6.4)/2 x1=3.7 x2=(1-6.4)/2 x2= -2.7
 Graphs/442560: solve the system by graphing 2x-2y=-2 2x+3y=231 solutions Answer 305327 by mananth(12270)   on 2011-04-29 21:26:29 (Show Source): You can put this solution on YOUR website!2x-2y=-2 2x+3y=23 equation1 -2 = -2 when x= 0, y=1(0,1) when y = 0,x= -1(-1,0) Equation 2 when x= 0, y=7.67(0,7.67) when y =0,x=11.5(11.5,0) Plot the points and draw the line The solution is (4,5)
 Travel_Word_Problems/442590: Jill is 22 kilometers away from Joe. Both begin to walk toward each other at the same time. Jill walks at 3km/hr. They meet in 4 hours. How fast is Joe walking?1 solutions Answer 305322 by mananth(12270)   on 2011-04-29 21:12:23 (Show Source): You can put this solution on YOUR website!Jill 3km/h Joe xkm/h towrads each other so combined speed = x+3 km/h distance = 22 km t= distance/speed time = 4 h 22/(x+3)=4 22=4(x+3) 22=4x+12 4x=10 x=2.5 km/h Joe's speed
 Geometry_Word_Problems/442623: the area of a rectangular playground in a child care center is 250 square feet. The width of the playground is 20 feet less than twice the length. Fencing must be purchased by the whole foot and costs \$6.95 per foot. Find the cost of fencing purchased to surround the playground. 1 solutions Answer 305321 by mananth(12270)   on 2011-04-29 21:08:33 (Show Source): You can put this solution on YOUR website!let length be L width = 2L-20 Area = L * (2L-20)=250 2L^2=20L=250 2L^2-20L-250=0 /2 L^2-10L-125=0 Find the roots of the equation by quadratic formula a= 1 b= -10 c= -125 b^2-4ac= 100 - 500 b^2-4ac= 600=24.49 x1=(10+24.49)/2 x1= 17.25 x2=(10-24.49)/ 2 x2= -7.25 Ignore negative value Length = 17.25 Width = 2*17.25- 20=14.50 Perimeter = 2*17.25+2*14.50 Perimeter= 34.50+29 Perimeter=63.50 feet Cost = 63.50*6.95 \$441.32
 Quadratic_Equations/442619: Hi, I have an algebra question that states the following: (not sure where to go with this) If h = -16t^2 + 48t represents the height of a rocket, in feet, t seconds after it was fired, when will the rocket hit the ground? It does give a hint: "The rocket is on the ground when h = 0" So it states that the rocket will hit the ground after _______ second(s). 1 solutions Answer 305317 by mananth(12270)   on 2011-04-29 20:56:26 (Show Source): You can put this solution on YOUR website!At t=0, h=0, it is on ground before firing h=-16t^2+48 h =0 when it hits the ground after firing -16t^2+48=0 16t(-t+3)=0 /16 t(-t+3)=0 t= 0 OR t=3 It will hit after 3 seconds
 Equations/442618: Find the distance between P and Q, given the coordinates below P(7,3), Q(13,11)1 solutions Answer 305313 by mananth(12270)   on 2011-04-29 20:50:23 (Show Source): You can put this solution on YOUR website!Distance between two points x1 y1 x2 y2 d= 7 3 13 11 d= d= d= d= 10.00
 Travel_Word_Problems/442609: 2 cars are 500feet apart, traveling toward each other at 40mph.How much time does it take to be even with each other?1 solutions Answer 305311 by mananth(12270)   on 2011-04-29 20:48:02 (Show Source): You can put this solution on YOUR website!Towards each other so add up speeds. 80 mph 500 ft = 500/5280 miles t= d/r t=(500.5280) /(80) 500 / (5 280 * 80) = 0.00118371212 0.00118371212* 3600 = 4.26 seconds ( 1 hour = 3600 seconds)
 Travel_Word_Problems/442606: how long does it take for 2 cars traveling toward each other at 40mph to go 500 feet?1 solutions Answer 305308 by mananth(12270)   on 2011-04-29 20:42:17 (Show Source): You can put this solution on YOUR website!Towards each other so add up speeds. 80 mph 500 ft = 500/5280 miles t= d/r t=(500.5280) /(80) 500 / (5 280 * 80) = 0.00118371212 0.00118371212* 3600 = 4.26 seconds ( 1 hour = 3600 seconds)
 Quadratic_Equations/442383: whrite a quadratic equation in the variable x having the given numbers as solutions. type the equation in standard form, ax^2+bx+c=0 solution: 4, only solution1 solutions Answer 305122 by mananth(12270)   on 2011-04-29 09:59:17 (Show Source): You can put this solution on YOUR website!4 is the solution it is a quadratic equation (x-4)^2=0 x^2-8x+16=0
 Money_Word_Problems/442367: 20000\$ is split into two investments one paying 5% and the other paying 6.5% to the nearest cent how much should be invested in each so the yearly intrest from the 5% investment is double the intrest from 6.5% investment 1 solutions Answer 305120 by mananth(12270)   on 2011-04-29 09:53:25 (Show Source): You can put this solution on YOUR website!let investment at 6.5% be x Investment at 5 % = (20000-x) ... 5%x= 2*6.5%(20000-x) multiply by 100 5x=2*6.5(20000-x) 5x=130000-13x 18x=130000 x= 7,222.22 at6. 5% Balance at 6.5%
 test/442372: I need help solving algebra1 solutions Answer 305118 by mananth(12270)   on 2011-04-29 09:33:44 (Show Source): You can put this solution on YOUR website!what kind of help m.ananth@hotmail.ca
 Length-and-distance/442380: what is the length of a line segment connecting (2,-2)and(-3,-1)1 solutions Answer 305117 by mananth(12270)   on 2011-04-29 09:32:21 (Show Source): You can put this solution on YOUR website!Distance between two points x1 y1 x2 y2 d= 2 -2 -3 -1 d= d= d= d= 5.10
 Money_Word_Problems/442265: How do I solve this problem? A \$132,000 trust is to be invested in bonds paying 6%, CDs paying 5%, and mortgages paying 7%. The bond and CD investment together must equal the mortgage investment. To earn a \$8420 annual income from the investments, how much should the bank invest in bonds?1 solutions Answer 305082 by mananth(12270)   on 2011-04-29 02:18:39 (Show Source): You can put this solution on YOUR website!Bonds --- 6% ----- x CD's -----5%-------y Mortages--7%------x+y ... Interest to be earned = \$8420 Investment = 132,000 x+y+x+y = 132,000 2x+2y=132000 x+y = 66,000.........1 6x+5y+7(x+y) = 8420*100 6x+5y+7x+7y=8420*100 13x+12y=8420*100......2 ......... x+y=66000 .............1 13x+12y=842000 .............2 Eliminate y multiply (1)by -12 Multiply (2) by 1 -12x-12y =-792000 13x+12y= 842000 Add the two equations x=50000 investment in Bonds plug value of x in (1) x +y = 66000 50000 +y = 66000 y = 66000 -50000 y = 16000 y = 16000 Investment in CD's Mortage = 66,000
 Money_Word_Problems/442332: In what time will Rs.2000 amount to Rs.2125 at 5% simple inerest?1 solutions Answer 305076 by mananth(12270)   on 2011-04-29 02:07:26 (Show Source): You can put this solution on YOUR website!Interest = 125 (Amount - Principal) I= p*r*t 125= 2000*5/100 * t 100*125/(2000*5)=t t= 1.25 years
 Mixture_Word_Problems/442274: Extremely confused daughter tried to help and she is stumped this is from an algebra practice test word problem is: A merchant has coffee worth \$10 a pound that she wants to mix with 40 pounds of coffee worth \$80 a pound to get a mixture that can be sold at \$30 a pound. How many pounds of the \$10 coffee should be use. Can you explain and show how you came up with answer please. Thank you for any help you can give us.1 solutions Answer 305075 by mananth(12270)   on 2011-04-29 02:03:00 (Show Source): You can put this solution on YOUR website!------ Price ---------------- quantity Coffee type I 80 ---------------- 40 Coffee type II 10 ---------------- x Total 30 ---------------- 40 + x 80*40+10*x=30(40+x) 3200+10x=1200+30x 10x-30x=1200-3200 -20x=-2000 /-20 \ x= 100 pounds 10% Coffee type II
 Linear-equations/442275: why should we clear decimals when solving linear equations and inequalities1 solutions Answer 305074 by mananth(12270)   on 2011-04-29 01:55:25 (Show Source): You can put this solution on YOUR website!It is not a rule. But the calculations become easy and you can walk through
 Numbers_Word_Problems/442300: A boat traveled 210 miles downstream and back. The trip downstream took 10 hours. The trip back took 70 hours. What is the speed of the boat in still water? What is the speed of the current?1 solutions Answer 305073 by mananth(12270)   on 2011-04-29 01:53:55 (Show Source): You can put this solution on YOUR website!against current x- 70.00 hours with current x+ 10.00 hours Distance = same=210 Boat speed =x current speed =y t=d/r 210/(x-y)=70.00 70(x-y)=210.00 70x-70y =210 ....................1 210/(x+y)=10.00 10.00(x +y)=210 10.00x+10.00y=210 ...............2 Multiply (1) by 1.00 Multiply (2) by 7.00 we get 70x-70y=210 70x+70y=1470 140x=1680 /140 x =12 mph Boat speed plug value of x in (1) 70x-70y=210 840-70y=210 -70y=210-840 -70y=-630 y=9 mph current speed
 Distributive-associative-commutative-properties/442325: how do you factor 9-c^2d^21 solutions Answer 305066 by mananth(12270)   on 2011-04-29 01:42:34 (Show Source): You can put this solution on YOUR website!9-c^2d^2 (3)^2=(cd)^2 (3+cd)(3-cd)
 Polynomials-and-rational-expressions/442326: 2x^2+22x+361 solutions Answer 305064 by mananth(12270)   on 2011-04-29 01:40:14 (Show Source): You can put this solution on YOUR website!2x^2+22x+36 2(x^2+11x+18) 2{(x^2+9x+2x+18)} 2{x(x+9)+2(x+9)] 2(x+9)(x+2)
 Polynomials-and-rational-expressions/442329: x^2-11x+241 solutions Answer 305063 by mananth(12270)   on 2011-04-29 01:38:15 (Show Source): You can put this solution on YOUR website!x^2-11x+24 x^2-8x-3x+24 x(x-8)-3(x-8) (x-3)(x-8)
 Mixture_Word_Problems/441743: How much 5% maple syrup and water mixture must be added to 100% pure maple syrup to produce 5 quarts of syrup that is 10% maple syrup?1 solutions Answer 304825 by mananth(12270)   on 2011-04-28 03:47:00 (Show Source): You can put this solution on YOUR website! percent ---------------- quantity Maple syrup 5 ---------------- x 0 Quarts Maple syrup 100----------------5-x Quarts Total 10.00% ----------------5 Quarts 5x+100 (5-x)=10*5 5x+500-100x=50 5x-100x =50-500 -95 x= -450 /-95 x=4.74 quarts 5.00% 0.26 quarts 100.00%
 Mixture_Word_Problems/441768: How much 8% saline solution should Kent mix with 80 cubic centimeters of an 18% saline solution to produce a 12% saline solution?1 solutions Answer 304823 by mananth(12270)   on 2011-04-28 03:38:48 (Show Source): You can put this solution on YOUR website!------ Percent ----------------quantity Saline solution I 18 ----------------80 Saline solution II 8 ----------------x Total 12 ----------------80+x 18*80+8*x=12(80 +x) 1440+8x =960+12x 8x-12x=960-1440 -4x=-480 /-4 x=120 cu.cm 8% Saline solution II
 Mixture_Word_Problems/441789: Martin needs to mix some 40% alcohol solution with some 90% alcohol solution to obtain 15 liters of an 80% solution. How much of the 40% solution and how much of the 90% solution should he use? I need the answer quickly, so it would be greatly appreciated if I could receive an answer within a few hours. Thank you very much.1 solutions Answer 304822 by mananth(12270)   on 2011-04-28 03:31:34 (Show Source): You can put this solution on YOUR website! percent ----------------quantity Alcohol 40 ----------------x Alcohol 90 ----------------15-x Total 80.00% ----------------15 40x+90(15-x)=80 *15 40x+1350-90x=1200 40x-90x =1200-1350 -50x=-150 /-50 x=3 liters 40.00% 12 liters 90.00%