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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