Bonjour,
bilets de 5: x
billets de 20 : y
x+y = 30
5x+ 20y = 270
x= 30-y
5(30-y) +20y = 270
150 -5y +20y = 270
20y-5y = 270 - 150
15y = 120
y = 120/15 =>8 billets de 20
30 -8 => 22 billets de 5
20*8 + 22*5 =
160 +110 =270
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Bonjour,
bilets de 5: x
billets de 20 : y
x+y = 30
5x+ 20y = 270
x= 30-y
5(30-y) +20y = 270
150 -5y +20y = 270
20y-5y = 270 - 150
15y = 120
y = 120/15 =>8 billets de 20
30 -8 => 22 billets de 5
20*8 + 22*5 =
160 +110 =270