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Railways PYQCBT 1 2016

RRB NTPC · Question 62

In what ratio should 30% potassium nitrate solution be mixed with 60% potassium nitrate solution to get result as 40% potassium nitrate in the solution? A. 2 : 1 B. 3 : 1 C. 1 : 3 D. 4 : 5

  1. A

  2. C

  3. D

  4. B

Show answer & explanation

Answer: (A) A

Explanation

By alligation: (60 − 40) : (40 − 30) = 20 : 10 = 2 : 1 (30% solution : 60% solution).