Question

How many liters of pure alcohol must be added to 10 liters of a 30% solution to obtain a 50 % solution?

Answer 1

Answer

4 litre

Explanation:

30%solution means..

.3lit alcohol and 7 lit water

50%solution means..50/100

after adding x lit of alcohol..

the ratio of alcohol and total solution will be as below..

(3+x)lit/(10+x)lit=50/100

3+x/10+x=1/2

6+2x=10+x

x=4 lit