Question

The length of the rectangle is $15cm$ more then its width. The perimeter is $150cm$. Find the dimension of the rectangle.

Answer 1

A] Given

l = 15 cm + b

P =2 (l+b) =150 cm

2(l+b) = 150

$\Rightarrow 2(15+b+b)=150$

$\Rightarrow 2(15+2b)=150$

$\Rightarrow 2\times 15+4b=150$

$\Rightarrow 4b=150-30$

$\Rightarrow 4b=120$

$\Rightarrow b=30$

so, l = 1 5 + 30

= 45 cm

$\therefore$ Dimensions are 45 cm & 30