Question

find the breadth of a rectangle whose perimeter is 168 m and length is 45.5m

Answer 1

perimeter of rectangle = 2(l+b)
168 = 2(45.5+b)
b = 84-45.5
b = 38.5

Answer 2

perimeter of rectangle = 2*(length +breadth)
168=2*(45.5+breadth)
breadth = 84-45.5=38.5m