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Railways PYQCBT 1 2020

RRB NTPC · Question 18

From 10 liters of solution 2 liters of water evaporated. The remaining solution was found to have 6% salt. What was the percentage of salt in the original solution?

  1. 5.6%

  2. 5%

  3. 4.8%

  4. 5.4%

Show answer & explanation

Answer: (C) 4.8%

Explanation

Evaporation removes only water, so the salt stays the same. After evaporation 8 litres contain 6% salt = 0.48 litre. In the original 10 litres that is 0.48/10 = 4.8%.