waecmaths question:
Three quarters of a number added to two and a half number gives 13. Find the missing number
Option A:
4
Option B:
5
Option C:
6
Option D:
7
waecmaths solution:
$\begin{align} & \text{Let the number be }x \\ & \tfrac{3}{4}x+\tfrac{5}{2}x=13 \\ & \frac{3x+10x}{4}=13 \\ & \frac{13x}{4}=13 \\ & x=\frac{13}{13}\times 4=4 \\\end{align}$
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