Question

The length of rectangular park is thrice its breadth and if the perimeter of the park is 168metres find its dimensions

Answer 1

Let be the breadth be b and length be 3b
Perimeter = 2(l+b)
168 m = 2(3b+b)
168 m = 2(4b)
4b = 168/2
4b = 84 m
b = 84/4
b = 21 m

Length = 3*21 = 63 m
Breadth = 21 m

Answer 2

Let the breadth of this rectangle be x
and the length of this rectangle be 3x
A/Q
2(Length + Breadth) =perimeter of rectangular park.
2( 3x + x ) = 168 metres.
6x + 2x = 168 metres.
8x = 168 metres.
x = (168/8) metres.
x = 21 metres.

then, breadth = x = 21 metres.
and length = 3x = 3× 21 = 63 metres.