waecmaths question:
If $E=\frac{MN}{S+N}$ and E =75, M = 120, N = 5000, find S
Option A:
1000
Option B:
2000
Option C:
3000
Option D:
4000
waecmaths solution:
$\begin{align} & E=\frac{MN}{S+N} \\ & 75=\frac{120\times 5000}{S+5000} \\ & 75(S+5000)=60000 \\ & S+5000=8000 \\ & S=3000 \\\end{align}$
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