Notam m,p,g mere pere si gutui
Date:
2m+3p+5g=43
3m+5p+2g=39
5m+2p+3g=38
Daca adunam relatiile obtinem ca
10m+10p+10g=120 /:10
m+p+g=12
Vom usura un pic relatiile inlocuind ce am obtinut astfel:( taiem din fiecare din cele 3 ecuatii 2 m 2p 2g si 24 de lei)
p+3g=19 =>p=19-3g
m+3p=15 =>m=15-3p
g+3m=14
g+3(15-3p)=14
g+45-9(19-3p)=14
g+45-171+27p=14
28g=140
g=5 => p=19-15=4 => m=15-12=3
