The sums are:
1: 15
2: 34
3: 42
magic box 1 is 15
34
the magic sums are 15, 34, and42
the answers for mission 7 are 15 34 42 (the answers are in order)!
The 3rd magic sum in the 39 clues game is 42.
15,34,42
34
15
15
You have to find out what the answers are in the cards itself.
15-34-42
34 I think.