CHRONO

27 s.

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

CHRONO

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