Solution Y is 30 percent liquid X and 70 percent water. If 2 kilograms of water evaporate from 8 kilograms of solutions Y and 2 kilograms of solution Y are added to the remaining 6 kilograms of liquid, what percent of this new liquid solution is liquid X?  Choose the correct choice.
A) 30 %
B) 33 1 / 3 %
C) 37 1 / 2 %
D) 40 %
E) 50 %

Rationale: "at the beginning , you have 8 kg of solution y , i . e . 70 % * 8 kg = 5,6 kg of water 30 % * 8 kg = 2,4 kg of x 2 kg of water evaporate : 5,6 kg - 2 kg = 3,6 kg of water 2,4 kg of x 2 kg of liquid are added : 3,6 kg + 2 * 0,70 = 5 kg of water 2,4 kg + 2 * 0,30 = 3 kg of x so you have 3 kg of x in 8 kg ( 3 + 5 ) solution . therefore x concentration is 3 / 8 = 37,5 % answer : c"
Answer: C