Question

The length of the rectangular hall is 18 metres more than its breadth if the perimeter of the hall is 84 metres find its length​

Answer 1

Answer:

30 m

Step-by-step explanation:

Let length be x m

than breadth = x-18 m

perimeter = 2( l+b)

84 = 2(x+x-18)

84=2(2x-18)

84=4x-36

4x=120

x=30m

Thus length is 30m

Answer 2

Answer:

$\huge\color{Blue}{Answer}$

$Let\:the\:breadth\:be\:x\:$

then,

$Length\:of\:rect.\:hall\:=x+18m$

P=2×(x+x+18)

84=2×(2x+18)m

84=4x+36

84-36=4x

48=4x

48/4=x

12=x

Length=x+18

=12+18

=40m