waecmaths question:
What is the value of m in the diagram?
Option A:
20o
Option B:
30o
Option C:
40o
Option D:
50o
waecmaths solution:
$\begin{align} & 4m-{{15}^{\circ }}=m+{{75}^{\circ }} \\ & 4m-m={{75}^{\circ }}+{{15}^{\circ }} \\ & 3m={{90}^{\circ }} \\ & m={{30}^{\circ }} \\\end{align}$
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