Question

Please help me I'm really confused.

Answer 1

1+5=6x3=18

2+10=12x3=36

3+15=18x3=54

4+20=24x3=72

72 should be the answer

Explanation:

Answer 2

72

Explanation:

The working was a long one so sorry, I can't fit it in, please tell me in the comments if this is ok.

:)