Sharman is 20 percent less efficient than Vivek. If Vivek can make a helmet in 20 days, then in how many days can Sharman make the same helmet?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 25 days.
If Vivek can make the helmet in 20 days, his efficiency is inversely proportional to the time taken
So,
Vivek's efficiency = 1/20
Since Sharman is 20% less efficient than Vivek
Sharman's efficiency = 0.8 × 1/20
⇒ 0.8/20 = 1/25
So,
Time taken by Sharman = 1/Sharman's efficiency
Time taken by Sharman = 1/1/25 = 25 days