1. /=fractie
A+b+c/3=310
A+b+c=3×310
A+b+c=930
A×2=b×3=c×5
2a=3b=5c
2a=3b
A=3b/2
3b=5c
C=3b/5
3b/2 + b+ 3b/5=930
Aducem la acel as numitor
Amplificam 3b/2 cu 5 si obținem 15b/10
Amplificam 3b/5 cu 2 si obținem 6b/10
Amplificam b cu 10 si obținem 10b/10
15b/5+ 10b/10+ 6b/10=930
15b+10b+6b/10=930
31b=930×10
31b=9300
B=9300/31
B= 300
A=3×300/2
A=450
C=3×300/5
C=180