Question

find the breadth of the rectangle whose length is 42m 50 cm and perimeter is 140 m

Answer 1

let the breadth be x
length = 42m 50cm
= 42.5m
perimeter of rectangle = 2 (l+b)
perimeter = 140
= 2( 42.5 + x) =140
=85 +2x =140
= 2x = 140 - 85
= 2x = 55
= x = 27.5m
or
27m 50cm
hope it helps
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Answer 2

Hey here is your answer u r looking for..

Length = 42m and 50 cm
= (42*100+50)cm
=4250cm
= 4250/100. (converting into metre)
= 42.5m

perimeter = 140m

perimeter of rectangle = 2(l+b)

140= 2(42.5+b)
140= 85+2b
2b=140-85
2b=55
b = 55/2
b = 27.5m


Hence, Breadth of rectangle = 27.5m

Hope its help!!