In a mixture of 45 litres the ratio of milk to water is 4:1. Additional 18 litres of water is added to the mixture. Find the ratio of milk to water in the resulting mixture.  Choose the correct choice from the following answers:	A) 2 / 1	B) 4 / 3	C) 2 / 3	D) 3 / 4	E) 3 / 2

Rationale: given that milk / water = 4 x / x and 4 x + x = 45 - - > x = 9 . thus milk = 4 x = 36 liters and water = x = 9 liters . new ratio = 36 / ( 9 + 18 ) = 36 / 27 = 4 / 3 . answer : b .
Answer: B