Question

We have:

Answer 1

Factorize 30.

30|2
15|3
5|5
1

$30=2\cdot3\cdot5\\ \Downarrow\\ a=2\\ b=3\\ c=5$

Answer 2

$30=2\cdot15=2\cdot3\cdot5$

If you have no other data such as a < b < c, or other (even-odd number), then you have 6 answers:

$235\\253\\325\\253\\523\\532$