UP Police Constable Exam Model Paper 1

Given:
A certain number of men can finish a piece of work in 50 days
Formula Used:
total work = number of men × number of days
Calculation:
Let that certain number of men be 'y'
⇒ y × 50 = (y - 4) × 70
⇒ 50y = 70y - 280
⇒ 20y = 280
⇒ y = 14
∴ The number of men initially is 14.