Question

The length of a rectangle is three times its breadth. The perimeter of the rectangle is 40cm. Find its length and width.
[3 marks]

Answer 1

Let width of rectangle (b) = x cm

Then, length of rectangle (l) = 3x cm
[1 mark]

As we know,

Perimeter of rectangle = 2(l+b)
[1 mark]

$\Rightarrow$ 40 = 2(3x + x)

$\Rightarrow$ 8x = 40

$\Rightarrow$ x = $\frac{40}{8}$ = 5 cm

Hence, the length is 15 cm and the width is 5 cm.
[1 mark]