CHRONO

71 s.

Additions à trous (a + b + ? = s <= 20).

CHRONO

0 s.
6 + 9 + = 17
2 + 5 + = 13
1 + 3 + = 10
4 + 6 + = 15
5 + 1 + = 9
1 + 4 + = 6
1 + 9 + = 19
9 + 2 + = 14
1 + 5 + = 7
4 + 4 + = 9
3 + 4 + = 11
7 + 4 + = 19
3 + 1 + = 12
4 + 7 + = 16
8 + 7 + = 16
4 + 8 + = 14
9 + 7 + = 18
5 + 7 + = 14
4 + 1 + = 6
2 + 9 + = 20