SOLUTION: how many liters of a 25% acid solution would we need to mix with 7 liters of 10% to produce 20% acid solution as a result?

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Question 423547: how many liters of a 25% acid solution would we need to mix with 7 liters of 10% to produce 20% acid solution as a result?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
.25m+7(.1)=.2(m+7)
.25m+.7=.2m+1.4
.05m=.7
m=.7/.05=14
We need 14 liters of 25% acid for our mix..