Question

The perimeter of a rectangle is 70 cm .If it's breadth is 5 cm less than the length, find its area

Answer 1

Answer:

let breadth be x

length = x+5

perimeter = 2(l+b)

2(x+5+x) = 70

2x + 5 = 35

2x = 30

x = 15

Length is 20 cm and breadth is 15 cm

Answer 2

let the breadth=x

length=x+5

perimeter= 70cm

formula to find perimeter of rectangle= 2 (l+b)

so,

2 (x+x+5)= 70

2x+2x+10= 70

4x=70-10

4x= 60

x= 60/4

x=15cm


length= x+5= 15+5= 20cm

breadth= 15cm

area will be=

20×15

= 300cm