waecmaths question:
A man bought 220 mangoes at N5x and sold each f or 3x kobo and made a gain of N8. Find the value of x
Option A:
2
Option B:
5
Option C:
6
Option D:
10
waecmaths solution:
$\begin{align} & 220mangoes\to 5xNaira \\ & 1mangoes\to \frac{5x}{220}\times 100kobo=\frac{25x}{11}kobo \\ & Gain=3xkobo-\frac{25x}{11}kobo \\ & \text{The gain was 8Naira which was equivalent to }800kobo \\ & 800=\left( 3x-\frac{25x}{11} \right)220mangoes \\ & 800=660x-500x \\ & 800=160x \\ & x=\frac{800}{160}=5 \\\end{align}$
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