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Question 320658: How many liters of a 45% acid solution must be added to 15 liters of a 30% acid solution to produce a 35% acid solution?
I tried 45%(x) + 30%*(15-x)= (35%)(15)
.45+.30(15-x)=(.35)(15)
.45x + 4.5 -.30x+ 5.25
.15x +4.5 = 5.25
-4.5 = -4.5
.75/.15 = 5% answer
Thank you; Word problems are definitely my weakness in understanding and setting up.

Click here to see answer by ankor@dixie-net.com(22740)

Question 320662: The length of a picture without its border is 7 inches less than twice its width. If the boarder is 1 inch wide and the area is 62 square inches, what are the dimensions of the picture alone?
2X-7+1=62
6-2X=62
+6= +6
=68/2
34= 8.5 BY 4

Thank you for your help.

Click here to see answer by ankor@dixie-net.com(22740)

Question 320835: Suppose a 2% acid solution is mixed with a 3% acid solution. Find the percent of acid in the following mixture:
a mixture that contains 3 times more 2% acid solution than 3% acid solution.
Click here to see answer by stanbon(75887)

Question 321154: A merchant blends tea that sells for $3.00 a pound with tea that sells for $2.75 a pound to produce 80 pound of a mixture that sells for $2.90 a pound. How many pounds of each type of tea does the merchant use in the blend.
Click here to see answer by josmiceli(19441)

Question 321345: urgent!!!!!!!!!!! URGENT!!!!!!!!!!!! UrGeNt!!!!!!!!!!!!!!!!! uRgEnt!!!!!!!!!!!!!

1. a chemist has 400 grams of salt solution that is 10% salt. How many grams of 20% salt solution must be added to obtain a 12% solution of salt?

2. How much salt must be added to 800 grams of a solution that is 15% to obtain a solution that is 20% salt.

3. What should be the alcohol content a winemaker must add to 10 gallons of wine that is 12% alcohol to have 15 gallons of wine that is 14% alcohol?
4. A chemist mixes a 200 L of a solution that is 60% acid with a 300 L of a solution that is 20% acid. What is the percentage of the mixture.
5. How much water must be added to 20 L of a 10% solution of boric acid to reduce it to a 4% solution/
6. How many liters of pure acid should be added to 25 liters of a 60% solution of acid to obtain a 75% acid solution?
7. How many grams of water must be evaporated from 100 kilograms of a 40% salt solution to produce a 50% salt solution?

urgent!!!!!!!!!!! URGENT!!!!!!!!!!!! UrGeNt!!!!!!!!!!!!!!!!! uRgEnt!!!!!!!!!!!!!

Click here to see answer by Dummy Alphabet(3)

Question 321481: How many ounces of an alloy containing 30% gold on the world market must be added to 10 ounces of an alloy containing 5% to produce an alloy containing 20% gold?
Click here to see answer by galactus(183)

Question 321483: The capacity of a car radiator is 18 quarts. If it is full of a 20% antifreeze solution, how many quarts must be drained off and replaced by a 100% solution to give 18 quarts of a 39% solution?
Click here to see answer by galactus(183)

Question 321525: a chemist has two solutions. one solution is 20% salt and the other is 45% salt. How many liters of each must be used to produce 100 liters of a solution that is 30% salt?
Please help...Thanks!!!!
Click here to see answer by scott8148(6628)

Question 321528: A mixture of 14% disinfectant solution is to be made from 10% and 20% disinfected solutions. How much of each solution should be used if 20 gallons of 14% solutions are needed?
Click here to see answer by mananth(16946)

Question 321511: It is necessary to have a 40% antifreeze solution in the radiator of a certian car. The radiator now has 60 liters of 20% solution. How many liters of this should be drained and replaced with 100% antifreeze to get the desired strength?
Click here to see answer by mananth(16946)

Question 321728: A 280 mL solution is 20% salt. How much water should be added to make the solution 14% salt?
Click here to see answer by Fombitz(32388)

Question 322012: Angie bought some golf balls for $24. If each ball had cost $0.50 less, she could have purchased one more ball for the same amount of money. How many golf balls did Angie buy?
Click here to see answer by nyc_function(2741)

Question 322144: A scientist has two solutions,which she has labeled Solution A and B.
Each contains salt. She knows that Solution A is 65% SALT and Solution B is 90%
SALT. She wants to obtain 120 ounces of a mixture that is 85% salt.
How many ounces of EACH solution should she use?
Solution A: _ ounces
Solution B:_ ounces
Thanks.
Click here to see answer by galactus(183)

Question 322471: The owner of Nuts2U Snack Shack mixes cashews worth $6.25 a pound with peanuts worth $2.00 a pound to get a half-pound mixed nut bag worth $1.70. How much of each kind of nut is included in the mixed bag?
Click here to see answer by nyc_function(2741)

Question 322815: Your piggy bank has a total of 40 coins in it. Some are dimes and some are nickles. If you have a total of $3.50, how many dimes do you have?
Click here to see answer by josmiceli(19441)

Question 323122: Brianna has an alloy containing 10% gold. Emma has 1/2 ounces of an alloy
containing 71% gold. They combined their alloys to make an alloy with 46 3/5% gold. Gold is worth $209.31 an ounce at the current market value. Brianna estimated the value of the new alloy to be $81.28 an ounce. How many ounces of Brianna's alloy were used?
Click here to see answer by galactus(183)

Question 323155: Amanda needs a mixture of 20.16% oats and 79.8% corn. She currently has 28 pounds
of a mixture of 90% oats. How many pounds of corn should be added to the mixture?
Click here to see answer by josmiceli(19441)

Question 323306: Gabrielle, a chemistry student has a 70% alcohol solution and 40% alcohol solution. Her teacher instructed her to prepare 150ml of a solution that is 60% alcohol by mixing amounts from each of the available solutions. How much of each solution should she use?
Click here to see answer by nerdybill(7384)

Question 323455: A 40% dye solution is to be mixed with a dye solution to get 120 liters of a 50% solution. How many liters of the 40% and 70% solutions will be needed?
Click here to see answer by josmiceli(19441)

Question 323577: find the least number which is both a multiple of 24 and a multiple of 30.
Click here to see answer by Edwin McCravy(20056)

Question 323585: A chemist has two different solutions. One has 50% alcohol and 50% water and the other has 75% alcohol and 25% water. How many liters of each should be mixed to obtain 8 liters of solution comprised of 60% alcohol and 40% water?
Click here to see answer by mananth(16946)

Question 323576: Jack's stride is 64 cm long and Jill's is 56 cm long. If they start together, how far have they walked when they are next in step?
Click here to see answer by mananth(16946)

Question 323578: A plank can be sawn exactly into pieces 1 meter long, 1.5 m long or 2 m long. Find the least possible length of the plank.
Click here to see answer by mananth(16946)

Question 323575: A bag containing sugar weighs 300 g. Find the least number of such bags which together weigh a whole number of kg.
Click here to see answer by JBarnum(2146)

Question 323498: an airplane covers a distance of 1500 miles in three hours when it flies with the wind and 31/3 hours when it flies against the wind. what is the speed of the plane in still air?
Click here to see answer by Fombitz(32388)

Question 323862: You want to mak 10 pound mixture of almonds and peanuts that is worth $4.60 per pound. The almonds are worth $5 per pound and the peanuts are worth $3 per pound. How many almonds and peanuts should you use?
Click here to see answer by Fombitz(32388)

Question 323909: chandra has 3 liters of a 14% solution of sodium hydroxide in a container. What is the amount and concentration of sodium hydroxide solution she must add to this in order to end up with 7 liters of 34% solution?
Click here to see answer by mananth(16946)

Question 324065: a chemical solution contains 1% salt. How much salt is in 2.5 ml of solution? Round your answer to the three decimal places.
Click here to see answer by rfer(16322)

Question 324201: If different ordering makes dfferent arrangements, find the total numbe of 3- letter arrangements that can be chosen from the letters: BYLAWS, it the letters cannot be repeated?

Click here to see answer by galactus(183)

Question 323406: HOW MUCH OF A 41% SOLUTION IS NEEDED TO MAKE 15 GALLONS OF 2% SOLUTION?
Click here to see answer by Fombitz(32388)

Question 323496: how many ounces of 30% hydrochloric acid solution and 80% hydrochloric acid solution must be mixed to get 10 ounces of 50% hydrochloric solution?
Click here to see answer by Fombitz(32388)

Question 324285: A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 10% cement should he mix with 8 bags of 12.5% cement to produce a mix containing 11% cement.
Click here to see answer by nyc_function(2741)

Question 324322: solve:
3x+3y+3z+w=0
2x+2y+3z+2w=0
4x+3y+2z+3w=0
Click here to see answer by Alan3354(69443)

Question 324412: If a person have 14,000 and 1/3 is taken out what is left?
Click here to see answer by JBarnum(2146)

Question 324552: A chemical manufacturer wishes to fill an order of 800 gallons of 25% acid solution. Solution of 25% and 35%are in stock. How many gallons of each solution must be mixed to fill the order?
Click here to see answer by stanbon(75887)

Question 324579: A chemical solution has a hydronium-ion concentration of 4.84 x 10^-7 mole per liter. Determine the pH of the solution.
thanks
Click here to see answer by Fombitz(32388)

Question 324683: how many mL of each of 45% solution and a 15% solution should be mixed in order to obtain 25 mL of a 30% solution?
Click here to see answer by stanbon(75887)

Question 324774: Can someone please step me through the following question?
A radioactive material decays according to the formula A = A0(2)-t. How much of a 5 gram sample will be left in 3 years?
Thank you,
Alberto
Click here to see answer by Fombitz(32388)

Question 324623: A scale on a map states that every � of an inch represents 20 miles. If two cities are 3 � inches apart, how many miles are actually between the two cities?
Click here to see answer by Fombitz(32388)

Question 324803: A chemist has 35% NaCl solution and 50% NaCl solution. How many liters of each should he mix to get 10L of NaCl solution with 40% base concentration?
Click here to see answer by Fombitz(32388)

Question 324805: Hydrochloric acid and distilled water were mixed to produce 210 mL of solution. If 120 mL more water was used than HCL, how many milliliters of each were mixed?
Click here to see answer by Fombitz(32388)

Question 324669: If I were to draw a circle and on the circumference, pick any different 7 points and order does not make a difference, how many different triangles could be formed by connecting any three points at a time.
Thanks so much for the help!
Click here to see answer by scott8148(6628)

Question 324878: Solution A is 25% acid and solution B is 40% acid. How much of each is needed to make 60 liters of a solution with 30% acid?
Click here to see answer by nyc_function(2741)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790, 11791..11835, 11836..11880, 11881..11925, 11926..11970, 11971..12015, 12016..12060, 12061..12105, 12106..12150, 12151..12195, 12196..12240, 12241..12285, 12286..12330, 12331..12375, 12376..12420, 12421..12465, 12466..12510, 12511..12555, 12556..12600, 12601..12645, 12646..12690, 12691..12735, 12736..12780, 12781..12825, 12826..12870, 12871..12915, 12916..12960, 12961..13005, 13006..13050, 13051..13095, 13096..13140, 13141..13185, 13186..13230, 13231..13275, 13276..13320, 13321..13365, 13366..13410, 13411..13455, 13456..13500, 13501..13545, 13546..13590, 13591..13635, 13636..13680, 13681..13725, 13726..13770, 13771..13815, 13816..13860, 13861..13905, 13906..13950, 13951..13995, 13996..14040, 14041..14085, 14086..14130, 14131..14175, 14176..14220, 14221..14265, 14266..14310, 14311..14355, 14356..14400, 14401..14445, 14446..14490, 14491..14535, 14536..14580, 14581..14625, 14626..14670, 14671..14715, 14716..14760, 14761..14805, 14806..14850, 14851..14895, 14896..14940, 14941..14985, 14986..15030, 15031..15075, 15076..15120, 15121..15165, 15166..15210, 15211..15255, 15256..15300, 15301..15345, 15346..15390, 15391..15435, 15436..15480, 15481..15525, 15526..15570, 15571..15615, 15616..15660, 15661..15705, 15706..15750, 15751..15795, 15796..15840, 15841..15885, 15886..15930, 15931..15975, 15976..16020, 16021..16065, 16066..16110, 16111..16155, 16156..16200, 16201..16245