waecmaths question:
If $F=\frac{9}{5}C+32$, find C when F =98.6
Option A:
30
Option B:
37
Option C:
39
Option D:
41
waecmaths solution:
$\begin{align} & F=\frac{9}{5}C+32 \\ & 98.6=\frac{9}{5}C+32 \\ & 98.6-32=\frac{9}{5}C \\ & 66.6=\frac{9}{5}C \\ & C=\frac{66.6\times 5}{9}=37 \\\end{align}$
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