SOLUTION: How much water must be added to 300 L of a solution so that its concentration may change from 25% to 20%?

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Question 518029: How much water must be added to 300 L of a solution so that its concentration may change from 25% to 20%?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
from the point of view of the water
.75*300+x=.80*(300+x)
x=75
add 75 liters of water