8 men working 9 hours a day complete a piece of work in 20 days. In how many days can 7 men working for 10 hours a day complete the same piece of work?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. .
M1 × T1 × D1 = M2 × T2 × D2
⇒ 7 × 10 × D1 = 8 × 9 × 20
⇒ D1 = 1440/70 = days