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Question 310598: In a chemistry class, 7 liters of a 4% silver iodide solution must be mixed with a 10%
solution to get a 6% solution. How many liters of the 10% solution are needed?
Click here to see answer by Fombitz(32388)

Question 310597: How many liters of a 10% alcohol solution must be mixed with 50 liters of a 80% solution
to get a 20% solution?
Click here to see answer by Fombitz(32388)

Question 310674: This question was answered but I'm still confused. Can I please have some more help? High school was ten years ago, what little math ability I had is gone.
Thanks Again
My question is why is the quanity equation multiplied by 20 and not.2. Also when solving the two equations why does the 20a cancel, but not the 550? I know these are probably very simple, but I just don't understand.
How many ml of medication A which has a 20% concentration, and medication B which has a 65% concentration should be mixed to form a 550 ml solution that is 30.9%
-------------------------------
Equation:
Quantity Equation:::::::: a + b = 550 ml
Active Ingredient Eq: 0.20a + 0.65b = 0.309*550
----------------------
Solving using 2 equations and elimination:
Multiply thru the 1st equation by 20
Multiply thru the 2nd equation by 100
----------------------------------------
20a + 20b = 20*550
20a + 65b = 30.9*550
----------------------------
Subtract 1st from 2nd and solve for "b":
45b = 10.9*550
b = 133.22 ml (amt. of 65% solution needed in the mixture)
----
Since a + b = 550, a = 416.78 ml (amt. of 20% solution needed in the mix)
Click here to see answer by solver91311(24713)

Question 310711: I bought .9 pounds of sugar for $1.89. How much did each pound of sugar cost?
Click here to see answer by Fombitz(32388)

Question 310599: Bert is 22 kilometers away from Brenda. Both begin to walk toward each other at the same
time. Bert walks at 2.5 kilometers per hour. They meet in 4 hours. How fast is Brenda
walking?
Click here to see answer by ankor@dixie-net.com(22740)

Question 310828: How much water must be added to 300ML of a 60% acid solution in order to dilute it to a solution of 45% acids?
Click here to see answer by stanbon(75887)

Question 310604: A chemical solution contains 4% salt. How much salt is in 0.5 ml of solution? Round your
answer to three decimal places, if necessary.
Click here to see answer by stanbon(75887)

Question 311004: How much pure hydrocloric acid must be added to 40 milliliters of a 50% solution to obtain a 75% acid solution?

Click here to see answer by Fombitz(32388)

Question 311038: greg is supposed to add cranberry juice to apple juice to make 20 gallons of cranapple juice. A gallon of apple juice sells for $3.25 a gallon and a gallon of cranberry juice sells for $4.15. A gallon of cranapple juice sells for $3.43. How many gallons of each juice should he use in the mixture
Click here to see answer by nerdybill(7384)

Question 311206: A merchant has coffee worth $20 a pound that she wishes to mix with 90 pounds of coffee worth $90a pound to get a mixture that can be sold for $50 a pound. How many pounds of the $20 coffee should be used?

Click here to see answer by nyc_function(2741)

Question 311236: how much pure alcohol must be added to 15 oz of a 60% solution of rubbing alcohol to change it to a 70% solution?
Click here to see answer by unlockmath(1688)

Question 311236: how much pure alcohol must be added to 15 oz of a 60% solution of rubbing alcohol to change it to a 70% solution?
Click here to see answer by mananth(16946)

Question 311246: hello we had a chap doing pre delivery inspections on diesel generators refering to the radiator; he was using acid containers to mix anti freeze and water i assume he did not rince the acid out before using containers now the radiators smell like strong amonia and the radiators are starting to leak ;my question is can a small part af battary acid damage the core and cause the radiator water to smell like amonia . thank you
Click here to see answer by Fombitz(32388)

Question 311339: I have a 41% solution of liquid and I want to make 1 gallon of a 2% solution... how many oz of 41% solution per gallon?
Click here to see answer by fractalier(6550)

Question 311423: One liter of 70% alcohol is needed. How much of 95% alcohol could be used to satisfy the 70% originally required?
Click here to see answer by Alan3354(69443)

Question 312625: How many milliliters of water must be added to 10 milliliters of a 30%-sulfuric acid solution to make a 15%-sulfuric acid solution?
Click here to see answer by mananth(16946)

Question 312726: HOW CAN YOU MAKE A 10% MIXTURE FROM 5% AND 50% MIXTURES
Click here to see answer by mananth(16946)

Question 312855: How many pounds of 7% fat hamburger must be mixed with 30 pounds of 15% fat hamburger to obtain a 10% fat mixture?
Click here to see answer by nerdybill(7384)

Question 312904: A store mixes a Brazilian coffee worth worth $12 per kilogram and a Venezueluen coffee worth $16 per kilogram. The mixture is to sell for $13 per kilogram. Find out how much of each should be used to make a 384-kilogram mixture.
I honest to God have no idea how to even start
Click here to see answer by mananth(16946)

Question 312896: I have a one gallon container and I need to make up a 2.5% solution of acetic acid in that 1 gallon container. How much 99% Acetic Acid in mLs do add, to how much water in mls to make up a 2.5% solution of Acetic Acid?
Click here to see answer by ankor@dixie-net.com(22740)

Question 312892: Tina has 2 credit cards that have a total balance of $32,400. One card has an interest rate of 10% and the other has an interest rate of 8%. The first year accumulated $1892 in interest charges. How much was the loan on each credit card?
Click here to see answer by checkley77(12844)

Question 312884: How many grams of pure silver must a silversmith mix with a 45% silver alloy to produce 200 grams of a 50% alloy?
Click here to see answer by checkley77(12844)

Question 313071: How many mL of 20% acid solution must a scientist add to 80 mL of 5% solution to create a 10% acid solution?
Click here to see answer by CharlesG2(834)

Question 313284: 62(200
Solution A is 80% Alcohol and Solution B is 30% Alcohol. How many Liters of each Solutions should be mixed in order to make 200 liters of a Solution that is 62% Alcohol ?
Click here to see answer by Fombitz(32388)

Question 313228: A 30-lb mixture of dried cranberries and blueberries costs $8.98 per pound. The mixture contains 12 pounds of dried cranberries that coast $4.99 per pound. What is the cost per pound of the dried blueberries?
Click here to see answer by Fombitz(32388)

Question 313580: a flock of geese on a pond were being observed continuously
1:00 p.m. 1/5 of the geese flew away
2:00 p.m. 1/8 of the geese that remained flew away.
3:00 p.m. 3 times as many geese as had flown away at 1:00 p.m. flew away, leaving 28 geese on the pond. At no other time did any geese arrive or fly away of die. How many geese were in the original flock?
Click here to see answer by OmniMaestra(21)

Question 313732: Type A sugar normally costs 75pesos per kilogram. It is mixed with Type B, which normally costs 80 pesos per kilogram, to form a mixture that costs 78pesos per kilogram. If there are 10 kilograms of the mixture, how many kilograms of Type A were used?
Click here to see answer by mananth(16946)

Question 313750: Amy paid $69.04 for a pair of running shoes during a 20% off sale.
What was the regular price
The regular price was $_______
Click here to see answer by rapaljer(4671)

Question 314006: how many liters of a 30% solution should be added to 50 liters of a 15% solution if the final mixture should contain 20% solution?
Click here to see answer by stanbon(75887)

Question 313923: While in Europe, Allison heard a weather forecast that said the temperature would be 22�C (this is about 74�F). Give a rule that could give Allison an easy way to convert from Celsius to Fahrenheit.

A.Double the Celsius temperature and add 30. B)Triple the Celsius temperature and add 30. C)Triple the Celsius temperature and subtract 10. D)Add 52 to the Celsius temperature

Click here to see answer by rfer(16322)

Question 314309: Solution A is 20% alcohol, and solution Bis 70% alcohol. How Much of each is needed to make50 liters of a solution that is 60% alcohol?
Click here to see answer by checkley77(12844)

Question 314584: A container is partly filled with 12 liters of whole milk, containing 4% butterfat, How much 1% milk must be added to get 2% butterfat
Click here to see answer by stanbon(75887)

Question 314779: 1. Sam invested some money at 7% and then invested $4,000 more than twice this amount at 9%. His total annual income from the two investments was $2,860. How much was invested at 9%?

2. How many liters of a 10% alcohol soultion must be mixed with 30 liters of a 40% solution to get a 20% solution?
Click here to see answer by stanbon(75887)

Question 314801: how many gallons of a 40% antifreeze solution and a 70% antifreeze solution must be mixed to get 24 gallons of a 50% antifreeze solution?
Click here to see answer by Fombitz(32388)

Question 314820: the longest side of a right triangle is 9 inches longer than the shortest side. the remaining side is 2 inches shorter than the longest side. find the lengths of the sides by writing an equation and solving it.
show work please.
Click here to see answer by mananth(16946)

Question 314817: melody can type a document in 6 hours. it takes mariah 9 hours to type the same document. how long would it take them if they worked together?
could you please show work?
Click here to see answer by mananth(16946)

Question 314697: if you have 15 grams of NaCl dissolved in 3.0L of water creating a solution with a total mass of 3015 grams what is the molarity of the solution
Click here to see answer by Fombitz(32388)

Question 314949: find the length of the skid marks if the car is going 60 mph

Click here to see answer by Fombitz(32388)

Question 314822: in one mixture the ratio of gold:copper is 5:3 , in another mixture it is in 8:5, what is the ratio in the third mixture
Click here to see answer by Fombitz(32388)

Question 315028: Dianne was given $35,000 when she retired. she invested some at 7% interest and the rest at 9% interest. if she earned $2,910 in interest in one year, how much was invested in each account?
Click here to see answer by checkley77(12844)

Question 315125: If an object is propelled upward from a height of 96 feet at an initial velocity of 80 feet per second,then its height after t seconds is given by the equation h= -16t^2+80t+96 where h is in feet. After how many seconds will the object reach a height of 196 feet.
Click here to see answer by malaydassharma(59)

Question 315387: John is traveling to a meeting that is 28 miles away. He needs to be there in 30 minutes. How fast does he need to go to make it to the meeting on time?
Click here to see answer by rfer(16322)

Question 315378: If Steven can mix 20 drinks in 5 minutes, Sue can mix 20 drinks in 10 minutes, and Jack can mix 20 drinks in 15 minutes, how much time will it take all 3 of them working together to mix 20 drinks?
Click here to see answer by ankor@dixie-net.com(22740)

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