waecmaths question:
On a map, 1cm represent 5 km. Find the area on the map that represents 100km2
Option A:
2cm2
Option B:
4 cm2
Option C:
8cm2
Option D:
16cm2
waecmaths solution:
$\begin{align} & 1cm\to 5km \\ & 1c{{m}^{2}}\to 5km\times 5km=25k{{m}^{2}} \\ & 100k{{m}^{2}}\to \frac{1c{{m}^{2}}\times 100k{{m}^{2}}}{25k{{m}^{2}}}=4c{{m}^{2}} \\\end{align}$
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