Question

Corina si Maria au impreuna 160 de abtipilduri. Maria si Irina au impreuna 134 de abtipilduri,iar Corina si Irina au impreuna 146 de abtipilduri.Cate abtipilduri are fiecare fetita? As vrea in exercitiu de nr. necunoscut daca se poate.

Answer 1

Notam C = Corina
M = Maria
I = Irina
Avem
C+M=160
M+I=134
C+I=146
Si => C+M+M+I+C+I=160+134+146
C+M+M+I+C+I=440
2C+2M+2I=440
C+M+I = 440/2
C+M+I=220
Cunoastem C+M si inlocuim
C+M+I=220
160+I=220
I=60
Si acum scoatem
M+I=134
M+60=134
M=134-60
M=74
C+M=160
C+74=160
C=160-74
C=86

Answer 2

M=Maria
C=corina
avem
C+M=160
M+I=134
C+I=146
C+M+M+I+C+I=44o
2C+2M+2I-440
C+M+I+440/2
C+M+I=220
C+M+I-220
160+I=220