Question

a football court has a perimeter of 60 m and is 19 m in length what is the width

Answer 1

p=2 (l+b)
60=2 (19+ b)
60=38+2 b
2b=60-38=22
b=11 m

Answer 2

p=60
l=19

p=2(l+b)
p/2=l+b
p/2-l=b
b=60/2
=30-19
=11