SOLUTION: having problems with a mixture problem, could someone help me. the problem is a chemist needs to mix 20 liters of a 40% acid solution with a 70% acid solution to get a 50% acid sol

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Question 137657: having problems with a mixture problem, could someone help me. the problem is a chemist needs to mix 20 liters of a 40% acid solution with a 70% acid solution to get a 50% acid solution. how many liters of the 70% acid solution is needed?
Thank you so much
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
let x="liters of 70%" __ (40%)(20)+(70%)(x)=(50%)(20+x) __ multiplying by 10

80+7x=100+5x __ subtracting 80+5x __ 2x=20