Răspuns :
a |-----|
b |-----|-----| }170
c |-----|-----|+20
170-20=150
a=150:5=30
b=30×2
b=60
c=30×2+20
c=60+20
c=80
b |-----|-----| }170
c |-----|-----|+20
170-20=150
a=150:5=30
b=30×2
b=60
c=30×2+20
c=60+20
c=80
a+b+c = 170 ; b = 2a ; a = b/2 ; c-b = 20 ; c = 20+b ; inlocuim a si c in suma numerelor ;
b/2+b+20+b = 170 ; numitor comun 2
b+2b+40+2b = 340 ; 5b = 340-40 = 300 ; b = 300/5 = 60 ;
a = 60/2 = 30 ; c = 20+60 = 80 ;
