Sagot :
Bonjour,
1° tonneau:x
2° tonneau: y
x+y = 420
x-120 = y-50
x= y-50 +120
x= y +70
x+y = 420
y+70 +y = 420
2y = 420 -70
2y =350
y = 350/2=175
=> x= 420 - 175 =245
vérif:
245 - 120 =125
175-50 = 125
bonjour
x - 120 = 480 / 2 = 240
x = 240 + 120
x = 360
x - 50 = 240
x = 240 + 50 = 290
on a un tonneau de 360 L
360 - 120 = 240 L
un tonneau de 290 L
290 - 50 = 240 L
240 + 240 = 480 L