Răspunsuri

2014-04-28T11:02:19+03:00
A-pix,b-caiet,c-creion
a=4b
b=3c⇒a=12c
3a+4b+c=49
36c+12c+c=49
49c=49
c=1
a=12
b=3

2a+5b+3c=2.12+3.5+3.1=42 lei