Joey completed the school project in 15 days. How many days will Tim take to complete the same work if he is 25% more efficient than Joey?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 12 days.
Ratio of the efficiency of Joey and Tim = Joey : Tim = 4 : 5
We know,
Work done = Days × Efficiency
Let the efficiency of Joey and Tim be 4x and 5x.
Total work done by Joey = 15 × 4x = 60x
Time taken by Tim = 60x/5x = 12 days