waecmaths question:
The volume of a pyramid with height 15cm is 90cm3. If its base is a rectangle with dimensions xcm by 6cm, find the value of x
Option A:
3
Option B:
5
Option C:
6
Option D:
8
waecmaths solution:
$\begin{align} & Volume=\tfrac{1}{3}Ah \\ & A=\text{ Area of the rectangular base} \\ & 90=\tfrac{1}{3}(x\times 6)\times 15 \\ & 90=30x \\ & x=3cm \\\end{align}$
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