the plant in front of the house, grew 3.75 inches each week for 4 weeks. and the plant in the back of the house, grew 4 inches each week for 5 weeks. but since the plant in the back of the house was 5 weeks and the one in the front had 4 weeks. you would calculate each plant for the same amount of weeks. so if you would have done 20/4 and 15/4 or 20/5 and 15/5, the plant in the back would have grown fatser then the one in the front.
work:
15/4=3.75
20/5=4
20/4= 5
15/5= 5
