Question 39

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waecmaths question: 

The total surface area of the walls of a room, 7m long, 5m wide and xm high is 96m2. Find the value of x

Option A: 

$\tfrac{2}{3}$

Option B: 

2

Option C: 

4

Option D: 

8

waecmaths solution: 

$\begin{align}  & 2(lh+bh)=96 \\ & 2(7x+5x)=96 \\ & 12x=48 \\ & x=4 \\\end{align}$

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