48
2+2+2+2+2+2+2+2+2+2+2+2+1+1+1+1+1+1=30
30
There are 18 composite numbers up to and including 30
35
It is impossible for three prime numbers less than 30 to add up to 1955. After all, 30+30+30 is only 90.
There are 5 numbers in your list. Add them up and divide by 5.
15
9 9
None add up to 30; you would need at least three 6-sided die with numbers 6-11 to add to 30.
33
They are 29, 30 and 31.
2+5+11= 18.
552