Answer:
2cm per week
Step-by-step explanation:
6/3=2
8/4=2
10/5=2
growth/week=constant
He has 45 kids now.
2x+20+3x+10 = 180 (int. angles, parallel)
5x+30 = 180
5x=150
x=30
1 and 3/7 i think