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Railways PYQCBT 2 2017

RRB NTPC · Question 16

In a class, the ratio of boys to girls is 4 : 5. If four new boys joined the class, the number of boys would increase by 20%. Find the number of girls in the class.

  1. 30

  2. 35

  3. 20

  4. 25

Show answer & explanation

Answer: (D) 25

Explanation

Let boys = 4k and girls = 5k. Four new boys are 20% of 4k, so 0.8k = 4 and k = 5. Girls = 25.