A rectangular field has its breadth and length in the ratio 4 : 5.

A rectangular field has its breadth and length in the ratio 4 : 5. If the breadth of the field is 20 m less than the length, then the perimeter of the field in m is

  1. 240
  2. 300
  3. 360
  4. 540
Anurag Mishra Professor Asked on 21st April 2016 in Maths.
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1 Answer(s)

Answer: (3) 360 

Solution:-
The ratio of breadth and length of a rectangle = 4: 5
Then, let the breadth and length of the rectangle be 4 X and 5 X.

If the breadth of the field is 20 m less than the length.
Then,  5 X – 4 X = 20
X = 20

So, the breadth and length of the rectangle = 4 x 20 = 80 m and 5 x 20 = 100 m
Then, the perimeter of the rectangle = 2 (80 + 100)
= 2 x 180
= 360 m

Hence, the  correct answer is option (3) 360

Anurag Mishra Professor Answered on 21st April 2016.
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