Question

Six men take five days to complete a job. How long would
the same job take fifteen men?

Answer 1

2 days

Explanation:

Understanding :

• Number of men is inversely proportional to the number of days taken to complete a job
• 6 men take 5 days to complete 1
• Now the number of men is 15

Solving :

• Rate of change of men ∝ 1/Rate of change of days
• 15/6 ∝ 1/(d/5)
• 2.5 = 5/d
• d = 2 days