SOLUTION: A 6% acidic solution is combined with a 20% acidic solution to produce 35 gallons of a 12% acidic solution. Determine how many gallons of the 20% acidic solution should be used.

Question 910399: A 6% acidic solution is combined with a 20% acidic solution to produce 35 gallons of a 12% acidic solution. Determine how many gallons of the 20% acidic solution should be used.
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
We need a total of 35 gal at 12%
We want to know how many gal at 6% to mix with 20%
a+b=35,
0.06*a+0.2*b=0.12*35
a=35-b
0.06*(35-b)+0.2*b=4.2
2.1-0.06b+0.2*b=4.2
0.14*b=2.1
b=15
a=35-b
a=20 gal at 6%
b=15 gal at 20%
check
0.06*20+0.2*15=0.12*35
1.2+3=4.2
4.2=4.2
ok
codemx1

RELATED QUESTIONS
a 6% acidic solution is combined with a 20% acidic solution to produce 35 gallons of a... (answered by ewatrrr)

A 6% acidic solution is combined with a 20% acidic solution to produce 21 gallons of a... (answered by richwmiller)

Kelly, a chemist, was asked to prepare 24 gallons of a solution that is 50% acidic by... (answered by stanbon,Boreal,ikleyn)

How many mL of a 6% acidic solution must be added to 20 mL of a 14% acidic solution to... (answered by Nate)

A chemist is mixing a 11% acidic solution with a 6% acidic solution to obtain 600 mL of... (answered by Fombitz,amoresroy)

how much pure acid should be mixed with 7 gallons of a 40% acidic solution in order to... (answered by mananth)

how much pure acid should be mixed with 5 gallons of a 70% acidic solution in order to... (answered by stanbon)

how many liters of a 5% acidic solution must be mixed with a 20% acidic solution to make... (answered by stanbon)

how many ounces of pure acid added to 20 ounces of a solution that is 5% acidic to... (answered by scott8148)