Question

A rectangular park's length is 3 times its breadth. If its perimeter is 64 meters, calculate the length and breadth of a rectangular park?

Answer 1

Length of the park is 3times its breadth.
Length=3x
Breadth =x
And perimeter=64

Since we know that,

2(L+B)=Perimeter

So,
2(3x+x)=64
6x+2x=64
8x=64
x=8

Now,
Length=3x=3 ×8=64
Breadth=8

Answer 2

L = 3 B 

We know that 

Perimeter of a rectangle = 2 (L + B) 

64 = 2 (L + B)

BUT L = 3B

SO 

64 = 2 ( 4B)

B = 64÷8 = 8m

HENCE L = 3B = 242

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Hope it helps