Question 497429
how much water must be added to 300 litre of a solution so that its concentration may change from 25% to 20%
**
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