Question

find out the length of rectangle whose perimeter is 390 m and breadth is 75 m

Answer 1

perimeter of a rectngle is 2 into l +b
390=2(l+b)
390=2(l+75)
390=2l+2*75
390=2l+150
390-150=2l
240=2l
l=240 divided by 2
therefore l=120 
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Answer 2

Hi !

Length = l
Breadth = b = 75 m

Perimeter = 2(l + b)

2( l + b) = 390

2( l + 75) = 390

l + 75 = 390/2

l + 75 = 195 

l = 195 - 75

l = 120 m

length = l = 120 m