Patty can buy 5 packs of cookies because 15 / 3 = <<15/3=5>>5
Patty gets 120 cookies because 5 x 24 = <<5*24=120>>120
Patty would need to pay 12 cookies per week because 3 x 4 = <<3*4=12>>12
Patty can avoid 10 weeks of chores because 120 / 12 = <<120/12=10>>10
#### 10