Question 10

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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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