Correct option is B
Half the perimeter = 36 m
Length = 4 m more than the width
Concept used:
Perimeter of a rectangle = 2(Length + Width)
Half perimeter = Length + Width
Formula used:
L + x = 36
L = x + 4
Solution:
Substitute L = x + 4 into the first equation:
x + 4 + x = 36
2x + 4 = 36
2x = 32
x = 16
L = x + 4 = 16 + 4 = 20
Correct answer is (B) 20 m.