Correct Answer - Option 1 : 30 days
Given:
A is 25% more efficient than A, B takes 6 days more than A to complete a piece of work.
Concept:
Efficiency is inversely proportional to the time.
Calculation:
Ratio of efficiency of A and B = 125 ∶ 100
Ratio of time taken by A and B = 100 ∶ 125
Let A takes 100x days, and B takes 125x days to complete a piece of work.
Days taken by B – Days taken by A = 6
⇒ 125x – 100x = 6
⇒ 25x = 6
⇒ x = 6/25
Days taken by A = 100x
⇒ 100 × 6/25
⇒ 4 × 6
⇒ 24
And, days taken by B = 125x
⇒ 125 × 6/25
⇒ 5 × 6
⇒ 30
∴ B will take 30 days to complete the same work.