waecmaths question:
A rectangle has length xcm and width (x – 1)cm. if the perimeter is 16cm, find the value of xcm
Option A:
$3\tfrac{1}{2}cm$
Option B:
4cm
Option C:
$4\tfrac{1}{2}cm$
Option D:
5cm
waecmaths solution:
$\begin{align} & p=2(l+b) \\ & 2(x+x-1)=16 \\ & 4x-2=16 \\ & 4x=14 \\ & x=\frac{7}{2}=3\tfrac{1}{2}cm \\\end{align}$
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