17
11 digits. (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
No. Numbers divisible by 9 have digits that add up to a multiple of 9. 2+3+6=11, which is not a multiple of 9.
There are lots of them, like: 110, 132, 143, 154 and many others.
The digits of 330 are 3, 3 and 0, so the sum of those digits means add them up - 3+3+0=6
9
Because they're in multiples of three - a quick way to tell if a number is a multiple of three is to add up the digits and see if the digits add up to a multiple of three e.g 576, 5+7+6=18, 1+8=9, 9 is a multiple of three
23 or 41
Six digits that add up to 59
None add up to 30; you would need at least three 6-sided die with numbers 6-11 to add to 30.
If you add up the two digits and they make either 3, 6, or 9
if it's even and all the digits add up to a multiple of 3
22