Question 990374
the number 9 is doubled when you add 9 to it.

30 is divided by 2 and divided by 3 and divided by 5 evenly.

in fact, the factors of 30 are:

1*30
2*15
3*10
5*6


2*15 is also 2*3*5
3*10 8is also 3*2*5
5*6 is also 5*2*3


when you break 30 up into its prime factors, you get 2 * 3 * 5.