Răspuns :
Primul nr. |----|
Al doilea. |----|------------|
Al treilea. |----|------------|--------|
Iar de aici e simplu
a+b+c=80 |----|a
b=5+a |----|+5(b)
b=c-7 c=b+7 |----|b+7(c)
80-5-12=63
63:3=21(a)
b=21+5=26
c=26+7=33
b=5+a |----|+5(b)
b=c-7 c=b+7 |----|b+7(c)
80-5-12=63
63:3=21(a)
b=21+5=26
c=26+7=33