Question

The length of a rectangle is 1cm more than 2 times its breadth. Its perimeter is 80cm. What is its length

Answer 1

l=2x+1
b=x

perimeter=2(l+ b)
80=2(2x+1+x)
80=2(3x+1)
40=3x+1
39=3x
x=13
l=2x+1
l=2*13+1
l=37cm