SOLUTION: how many gallons of a 5% acid solution must be mixed with 90 gallons of a 1% acid solution to obtain a 2% acid solution

Algebra ->  Customizable Word Problem Solvers  -> Misc -> SOLUTION: how many gallons of a 5% acid solution must be mixed with 90 gallons of a 1% acid solution to obtain a 2% acid solution       Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 988359: how many gallons of a 5% acid solution must be mixed with 90 gallons of a 1% acid solution to obtain a 2% acid solution

Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
.
x=gallons 5% to be added
.
0.05x+0.01(90)=0.02(90+x)
0.05x+0.9=1.8+0.02x
0.03x=0.9
x=30
ANSWER: You should mix 30 gallons 5% acid solution.
.
CHECK:
0.05(30)+0.01(90)=0.02(120)
1.5+0.9=2.4
2.4=2.4