Question

The length of a rectangle is 1cm more than two times its breadth.Its perimeter is 80cm .What isits length?

Answer 1

$2(2x + 1 + x) = 80 \\ 6x + 2 = 80 \\ x = \frac{78}{6} \\ = 13$
length = 2×13+1
=26+1
=27

Answer 2

Length=2b+1
Breadth=b
2 (2b+1+b)
2 (3b+1)
6b+2
=80cm

6b=80-2
6b=78
b=
$\frac{78}{6}$
13cm

Breadth=13cm
Length=2×13+1
=27