a) 49 m2
b) 50 m2
c) 53.5 m2
d) 55 m2
Answer: a
Explanation:
$$\eqalign{
& {\text{Area}}\,{\text{of}}\,{\text{the}}\,{\text{wet}}\,{\text{surface}} \cr
& = \left[ {2\left( {lb + bh + lh} \right) – lb} \right] \cr
& = 2\left( {bh + lh} \right) + lb \cr
& = \left[ {2\left( {4 \times 1.25 + 6 \times 1.25} \right) + 6 \times 4} \right]{m^2} \cr
& = 49\,{m^2} \cr} $$
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