If 4 taps can fill a tank in 15 minutes, how many taps are needed to fill it in 6 minutes?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 10.
This is an inverse proportion problem (more taps → less time).
Formula: Taps × Time = Constant
So, 4 taps × 15 min = x taps × 6 min
4 × 15 = x × 6
60 = 6x
x = 60 / 6 = 10