Question

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

Answer 1

Breadth=x
Length=3x

Perimeter of Rectangle=2(L+B)
84=2(3x+x)
84=2(4x)
84=8x
x=10.5cm

Length=3x=3*10.5=31.5cm
Breadth=x=10.5cm

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Answer 2

Let the width be x
Length = 3x
2(Length +width) = 84
2(3x+x)=84
4x=42
x=10.5
Width = 10.5
Length = 31.5