How many Kilograms of Pure water is to be added to 100 Kilograms of a 30% saline solution to make it a 10% saline solution.  Choose the correct choice from the following answers:  A) 100  B) 200  C) 300  D) 400  E) 500

Rationale: let x be the weights , in kilograms , of pure water to be added . let y be the weight , in kilograms , of the 10 % solution . hence x + 100 = y x = 200 kilograms . answer b
Answer: B