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

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Question 497429: how much water must be added to 300 litre of a solution so that its concentration may change from 25% to 20%
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Answer by lwsshak3(11628) About Me  (Show Source):
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how much water must be added to 300 litre of a solution so that its concentration may change from 25% to 20%
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let x=litres of water which must be added
25%*300=20%(300+x)
75=60+.2x
.2x=15
x=75
Ans:
75 litres must be added to 300 litres of the 25% solution