Bonjour,
farine: x
levure: y
x+y = 23
x= 23 -y
50x +24y = 760
(50 * 23-y) +24y = 760
1150 - 50y +24y = 760
1150 -26y = 760
1150 - 760 = 26y
390 = 26y
y = 390/26 = 15
Donc 15 sacs de levure et
23 -15 =>8 sacs de farine
Vérif:
15 * 24 + 8*50 = 360+400= 760