Question

A rectangle with breadth 15cm less than its breadth if its perimeter is 430m find its area

Answer 1

Let the length be x.
2(x+x-15) =430
2(2x-15)=430
4x-30=430
4x = 430+30 =460
x =460/4 =115
breadth = 115-15 =100

Answer 2

let the length=x cm then breadth=(x-15)cm

perimeter of rectangle=430cm
2(l+b)=430
l+b=430/2
x+(x-15)=215
x+x-15=215
2x=215+15
2x=230
x(length)=230/2=115cm
x-15(breadth)=115-15=100cm

area of rectangle=l*b
=115*100
=11500cm^2

Hope it helps you.......