Ioana,Malina si Ana cantaresc impreuna 165 kg. ioana cantareste o data si jumatate cat malina , iar Malina cantareste o data si un sfert cat ana. cate kg are fiecare?
I+M+A=165 kg I=M+M:2 /×2 2I=2M+M 2I=3M I =3M/2 M=A+A:4 /×4 4M=4A+A 4M=5A A=4M/5 inlocuim in prima ecuatie i functie de M 3M/2+M+4M/5=165 /×10 15M+10M+8M=1650 33M=1650 M=50 kg (Malina) I =3×50/2=3×25=75 kg (Ioana) A=4×50/5=4×10=40 kg (Ana)
