Question

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

Answer 1

Step-by-step explanation:

let width be x

then length is 3x

perimeter = 2(l+b)

2(x+3x) = 84

8x = 84

x = 10.5

lenght = 31.5

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Answer 2

Step-by-step explanation:

let the width be x

then length will be 3x

perimeter=2(3x+x)=84

8x=84

x=10.5

width=10.5m

length=31.5m