Raj is 20 percent less efficient than Rahul If Rahul can make a computer in 20 days, then Raj can make the same computer in how many days? .
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 25 days.
Rahul can make a computer in 20 days
Rahul's efficiency = 1/20 computers per day
Raj is 20 percent less efficient than Rahul
Raj's efficiency = 0.8 × Rahul's efficiency
Raj's efficiency = 0.8 × 1/20 = 0.8/20 = 1/25 computers per day
Thus, time taken by Raj = 1/Raj's efficiency
Time = 1/1/25 = 25 days
Thus, Raj will take 25 days to make the same computer.