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Railways PYQCBT 1 2016

RRB NTPC · Question 22

30 litres of salt solution contains 5% salt. How many litres of water must be added so as to get a resulted solution containing 3% salt? A. 20 litres B. 25 litres C. 30 litres D. 35 litres

  1. B

  2. C

  3. D

  4. A

Show answer & explanation

Answer: (D) A

Explanation

Salt in the solution = 5% of 30 = 1.5 litres. For this to be 3% of the new solution, its volume must be 1.5/0.03 = 50 litres. So 50 − 30 = 20 litres of water must be added.