question_answer

A mixture of 70 L of alcohal and water contains 10% of water. How much water must be added to the above mixture to make the water 12.5% of the resulting mixture?

A)  1 L

B)  1.5 L

C)  2 L

D)  2.5 L

Correct Answer: C

Solution :

By allegation method, Ratio of two mixture = 87.5 : 2.5 = 35 : 1 \[\therefore \] Water to be added \[=\frac{1}{35}\times 70=2\,\text{L}\]