Answer:
1. 30, 35, 40
Rule: Product of 5
2. 14, 15, 21
Rule: +6 and +1
3. 14, 17, 20
Rule: +3
4. 5/6, 6/7, 7/8
Rule: like a counting 5/6 then the 6 in the denominator of 5/6 and the 6 will become in numerator 6/7
5. I dont know sorry
