Question

The perimeter of a parallelogram is $80cm$. If the longer side is $20m$ greater than the shorter side, find the lengths of the sides of the parallelogram.

• A. $5,25$
• B. $10,30$
• C. $15,35$
• D. $20,40$

Answer 1

The correct option is B $10,30$

Let shorter side $=x$

Longer side $=x+20$

Perimeter $=80cm$

$\Rightarrow 2(x+x+20)=80cm\Rightarrow 2x+20=40\Rightarrow x=\frac{20}{2}=10cm$

hence, Shorter side $=10cm$
Longer side $=10+20=30cm$