Question

4(x-2) meters of rope is used to fence the rectangular enclosure . find x
[length of rectangle is 25 m and area is 225m square]

Answer 1

length = 25 m

breadth = b (say)

area = 225

25 x b = 225

b = 9

now

perimeter = 2( 25 + 9) = 2x34 = 68 m

so

4(x-2) = 68

x - 2 = 68/4

x - 2 = 17

x = 19

Answer 2

Let the breadth of rectangle be x
A/Q
Area of rectangle = 225
L × b = 225
25×b=225
b=225/25=9

perimeter of rectangle = 4(x-2)
2(l+b) = 4(x-2)
2(25+9)= 4(x-2)
2×34 = 4x - 8
68+8=4x
4x=76
x=76/4=19