a) 360 m3
b) 270 m3
c) 420 m3
d) None of these
Answer: b
Explanation: Given length of width of swimming pool is 9 m and 12 m respectively
Volume of swimming pool :
$$\eqalign{
& = 9 \times 12 \times \left( {\frac{{1 + 4}}{2}} \right) \cr
& = 9 \times 12 \times \frac{5}{2} \cr
& = 270\,\text{cu. metre} \cr} $$
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