Question

the length of a rectangle is three times its width if the perimeter is 84 find the length of the rectangle ​

Answer 1

Answer:

31.5

Step-by-step explanation:

perimeter of rectangle=2(l+b)

let b be x

then l = 3x

so 2(l+b)=84

2(3x + x)= 84

2(4x)=84

8x=84

x=84/8

x=10.5

l=3x=3(10.5)=31.5

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Answer 2

Let the width be x.

Let the length be 3x

Perimeter = 84

Perimeter of a rectangle = 2(l+b)

84 = 2(3x+x)

84 = 6x+2x

84 = 8x

OR

8x = 84

x = 84/8

x = 10.5

If x (width) = 10.5,then 3x (length) = 3×10.5=31.5

Note:- Dimensions have not been mentioned in the question.

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