Răspunsuri

2014-08-20T14:45:30+03:00
X-nr biletelor de 20 lei
y-nr biletelor de 25 lei

x+y= 500   |-20
20x+25y=11 000   inmultim prima ecuatie cu -20

-20x -20y= -10 000
20x+25y=11 000    adunam cele 2 ecuatii
/ 5y= 1 000

y= 200

x=500-200
x=300
2014-08-20T14:48:44+03:00
20*A+20*B=10000 20*A+20*B=11000 20A+25B-20*A-20*B=11000-10000 rezulta 5*B=100 B=200 bilete de 25 lei-s.au vandut A=500-200=300 bilete de 20 lei s.au vandut