Question

in 3 baloturi de stofa sunt in total 179 M in al doilea balot sunt cu 9 M mai putin decat in primu si cu 13 mai mult decat in al treileilea
Cati metri de stofa sunt in balot

Answer 1

Metoda figurativa
l_______l+13+9
l_______l+13
l_______l
Egalam partile:  179-(13+13+9)=179-35=144
In al treilea balot sunt:  144:3=48 m
In al doilea: 48+13=61 m
In primul: 61+9=70 m  
 R. 70m, 61m, 48m

Proba: 70+61+48=179

Answer 2

a+b+c=179
b=a-9       a=b+9
b=c+13      c=b-13
b+9+b+b-13=179
3b=179+4
b=183:3
b=61
a=b+9=61+9=70
a=70
c=b-13=61-13=48
c=48
proba 70+61+48=179