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Railways PYQCBT 1 2016

RRB NTPC · Question 15

A certain number men agreed to do a work in 20 days. 5 men did not come for work. Others completed the work in 40 days. Find the number of men who had agreed to do the work originally?

  1. 8

  2. 10

  3. 12

  4. 15

Show answer & explanation

Answer: (B) 10

Explanation

Let x men agree to do the work in 20 days: total work = 20x man-days. With 5 absent, (x − 5) men take 40 days: 40(x − 5) = 20x. So 40x − 200 = 20x, and x = 10.