Question

The length of a rectangle is twice its breadth. If the perimeter is 200 metre, find the length and breadth of the rectangle

Answer 1

Explanation:

let length be x

let breath be y

xy= 200m

2y = x

from above condition

2y x y =200....(x=2y)

2ysquare = 200

y square = 100

y= 10

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Answer 2

Answer:

Breadth=33.33 (rounded off to 33) Length=66.66 (rounded off to 67)

Explanation:

Assume a = breadth, so that means 2a = length.

Perimetre = 2 (l + b)

                 = 2 (a + 2a)

Now we will open the bracket, as follows:

                = (2 x a) + (2 x 2a)

                = 2a + 4a

                = 6a

So, 200 = 6a

Now we can easily solve the rest.

200 = 6a

= 200/6 = a

= 33.33

Thus, breadth (a) = 33.33 and length (2a) = 33.33 x 2 = 66.66

These two numbers can be rounded off to 33 and 67.