bonjour,
1 ) adultes = 78 - n
2 ) 15 ( 78 - n) + 10 n = 910
1 170 - 15 n + 10 n = 910
- 5 n = 910 - 1 170
- 5 n = - 260
n = 52
52 enfants et 26 adultes
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bonjour,
1 ) adultes = 78 - n
2 ) 15 ( 78 - n) + 10 n = 910
1 170 - 15 n + 10 n = 910
- 5 n = 910 - 1 170
- 5 n = - 260
n = 52
52 enfants et 26 adultes