Răspunsuri

2014-05-05T15:23:00+03:00
2s+3c=15 /-2
5s+6c=36

-4s-6c=-30
5s+6c=36
-------------------(+)
s=6

2*6+3c=15
12+3c=15
3c=15-12
3c=3
c=1

2 stilouri=6*2=12 lei
2 creioane=2*1=2 lei
Total=12+2=14 lei
Rest=20-14=6 lei