Question

5 pungi malai si 7 pungi cu faina cantaresc 29 kg, iar 5 pungi cu faina si 7 pungi cu malai cantaresc 31 kg.
cat cantareste fiecare punga ?

Answer 1

5m+7f=29
5f+7m=31
5m+7m+5f+7f=29+31
12m+12f=60
m+f=60/12
m+f=5
2f=29- (5*5)
2f=4
f=4/2
f=2 ( kg faina)
m=5-2
m=3 (kg mălai)