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WBCS Main Examination 2023 — Paper VI: Arithmetic and Test of Reasoning · Question 143 of 200

Q143
ArithmeticPercentage, Profit & Loss
A solution of salt and water contains 15% salt. If 4kg of water is evaporated, solution contains 18% salt. Find the original quantity of solution.
  1. a.12 kg
  2. b.18 kg
  3. c.24 kg
  4. d.36 kg

Answer: (C) 24 kg

The salt stays the same: 0·15x = 0·18(x − 4). So 0·03x = 0·72 and x = 24 kg. Check: 3·6 kg of salt is 15% of 24 kg and 18% of 20 kg.

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