Multiple choice

A contractor agreeing to finish a work in 150 days, employed 75 men each working 8 hours daily. After 90 days, only 2/7 of the work was completed. Increasing the number of men by ________ each working now for 10 hours daily, the work can be completed in time.

  1. 150 men

  2. 200 men

  3. 250 men

  4. 300 men

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Work done = 75 * 90 * 8 = 54000 man-hours for 2/7 of work. Total work = 54000 * 3.5 = 189000. Remaining work = 5/7 = 135000. Time remaining = 60 days. Men needed = 135000 / (60 * 10) = 225. Additional men = 225 - 75 = 150.