The perimeter can be calculated with 2(length+width). If we let the width be x then the length will be x+6. If we put this in the equation you get 60=2(x+x+6) 60=2(2x+6) 60=4x+12 48=4x 12=x So the width is 12cm. We substitute this into x+6. 12+6=18 The length is 18cm.
