Răspuns :
Metoda grafica
timbre straine l------l------l------l------l
timbre romanesti l------l
[____________]
126
126 : 3 = 42 timbre romanesti
42 + 126 = 168 timbre staine
Verific: 168 - 42 = 126 → diferenta
168 : 42 = 4 → catul
Raspuns: 168 timbre straine si 42 timbre romanesti
timbre straine l------l------l------l------l
timbre romanesti l------l
[____________]
126
126 : 3 = 42 timbre romanesti
42 + 126 = 168 timbre staine
Verific: 168 - 42 = 126 → diferenta
168 : 42 = 4 → catul
Raspuns: 168 timbre straine si 42 timbre romanesti
Notam:
s = numarul timbrelor straine
r = numarul timbrelor romanesti
s = r + 126
s = 4 × r
egalam cele doua relatii :
4 × r = r + 126
4 × r - r = 126
3 × r = 126
r = 126 : 3
r = 42 (timbre romanesti)
s = 42 + 126 = 168 (timbre straine)
Verificam:
168 = 4 × 42
168 = 168
s = numarul timbrelor straine
r = numarul timbrelor romanesti
s = r + 126
s = 4 × r
egalam cele doua relatii :
4 × r = r + 126
4 × r - r = 126
3 × r = 126
r = 126 : 3
r = 42 (timbre romanesti)
s = 42 + 126 = 168 (timbre straine)
Verificam:
168 = 4 × 42
168 = 168