Question

There is a milk sample with 50% water in it.If 1/3rd of this milk is added to equal amount of pure milk, then water in the new mixture will fall down to 

(a) 25% 

(b) 30% 

(c) 35% 

(d) 40%

Answer 1

Correct option (a) 25%

Explanation:

Percentage of milk in milk sample = 50%

It is added to equal amount of pure milk, i.e. in the ratio of 1:1 

Note: The information that 1/3rd of the milk sample is mixed is useless. 

Let 100 lt of milk sample is mixed with 100 lt of pure milk. Water in milk sample = 50 lt 

Percentage of water in the new mixture = [50/(100 + 100)] × 100 = (50/200) × 100 = 25%.