If 6 machines complete a task in 10 days, how many days for 15 machines at same rate?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 4.
Concept: Machines × Days = Constant
6 machines × 10 days = 60 machine-days
Now for 15 machines:
Days = 60 ÷ 15 = 4 days