find if 6 boxs are there.they each having 60,30,20 and 15 coins, how much next two

a n = 60 / n

a1 = 60 / 1 = 60

a2 = 60 / 2 = 30

a3 = 60 / 3 = 20

a4 = 60 / 4 = 15

a5 = 60 / 5 = 12

a6 = 60 / 6 = 10

12 and 10