Question

find the perimeter of rectangular field whose length is 4 times its width and which has area equal to 20736 square metre

Answer 1

let the breadth= x
length = 4x
perimeter = 20736
2(l+b) = 20736
2(4x +x) = 20736
by solving it further u can find the answer.

Answer 2

let the width of the rectangular field be x, then
the length will be 4x

according to question....

area of rectangle = length × breadth or width
20736 m sq. = 4x × x
20736 by 4 = x × x
5184 = x sq.
72 sq = x sq
72 = x
x= 72 metres

4x = 4 × 72
=288 metres