Start at 80, you are allowed to add 11 and take 7 as many times as you like. Can you make 70?

Question

Add together three of the numbers below to score 30.

Each number can be used as many times as you wish.

How many different combinations are there?

0 2 3 5 10 15 20 25

Answer 1

Add 11 once and remove 7 thrice
80+11 = 91
7X3 = 21
91-21 =70

Answer 2

Yes, because 80 + 11 - 7 = 84 is a multiple of 7.