Question

the length of a rectangle is three times its width .it the perimeter is 84 m, find the length of the number.​

Answer 1

Let breadth be x and length be 3x
Perimeter = 2(Length + Breadth)
84 = 2(3x + x)
84 = 2(4x)
84 = 8x

Answer 2

Answer:

let breadth of rectangle=x

length of rec. =3x

ATS

perimeter=84

2(l+b)=84

2(x+3x)=84

2(4x)=84

8x=84

x=84/8 =10.5

so length of rec. =10.5m