**Concept: The question tests on Percentage and comprehension of question and its inputs.**

**Solution Y:**

**Liquid X =30% AND Water = 70%**

8 Kg of Solution Y is taken and 2kg of Water evaporates from this.

=>

**8kg of Y has 30%of 8kg=2.4 kg of**__liquid X__originally in it2kg of Y that evaporated had 30% of 2kg or 0.6kg of liquid X in it.

The same is added back=>

**0.6 kg of liquid X that evaporated is added back to Y****Q. stem-**

__We have to calculate the new percentage of liquid X in this solution(originally it was 30%)__

This should be the "new" weight of liquid X in the solution/ Total weight of the solution *100

=2.4+0.6 / 8 =3/8 *100 = 37.5% (option c)