Question 17

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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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