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1. Having the same capacity 9 taps fill up a water tank in 20 minutes. How many taps of the same capacity are required to fill up the same water tank in 15 minutes ?

A. 10 taps

B. 12 taps

C. 15 taps

D. 18 taps

Solution:

\begin{aligned} [\frac{m_{1} \times h_{1} \times t_{1}}{w_{1}} = \frac{m_{2} \times h_{2} \times t_{2}}{w_{2}}] \\ 9_{t a p s} \times 20_{min} = t_{t a p s} \times 15_{min} \\ t = 12 taps \end{aligned}

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