Răspuns:
a+b+c=100
c=3•a
b =c:a
a|---------|
c|---------|----------|-----------|
b|---------|----------|-----------|--a--I }100
100-3=97
4 parti egale
97:4=24,25 (a)
24,25×3=72,75 (b)
72,75:24,25=3 (c)
algebric
a+b+c=100
c=3•a
b =c:a=>b=3a/3=>b=3
a+3+3a=100
4a=100-3
a=97:4=>a=24,25
c=24,25×3=>c=72,75
