Question

The length of a rectangular hallway is 3 times its breadth if the perimeter of the hallway is 40 m find its length and breadth

Answer 1

Let the breadth be x.
Then the length will be 3x.

Now,
Perimeter of a rectangle=2(l+b)
40=2(3x+x)
40=2×4x
40=8x
x=5

Therefore,
The breadth is x=5
And the lenght is 3x=3×5=15

Hope it helps u...