Răspuns :
Notam saptamanile cu :
1 saptamana => I
2 saptamana => II
3 saptamana => III
I + II + III = 450
I = III : 3 => III = 3I
I = II - 25 => II = I + 25
----------------------
I + I + 25 + 3I = 450
5I + 25 = 450
5I = 450 - 25
5I = 425
I = 425 : 5
I = 85
II = 85 + 25
II = 110
III = 3 x 85
III = 255
verificare : 85 + 110 + 255 = 195 + 255 = 450
Succes! :))
1 saptamana => I
2 saptamana => II
3 saptamana => III
I + II + III = 450
I = III : 3 => III = 3I
I = II - 25 => II = I + 25
----------------------
I + I + 25 + 3I = 450
5I + 25 = 450
5I = 450 - 25
5I = 425
I = 425 : 5
I = 85
II = 85 + 25
II = 110
III = 3 x 85
III = 255
verificare : 85 + 110 + 255 = 195 + 255 = 450
Succes! :))
Metoda grafica
prima saptamana l------l
a doua saptamana l------l+ 25 } total = 450 jucarii
a treia saptamana l------l------l------l
450 - 25 = 425 → suma celor 5 parti egale
425 : 5 = 85 jucarii au strans in prima saptamana
85 + 25 = 110 jucarii au strans in a doua saptamana
3 x 85 = 255 jucarii au strans in a treia saptamana
Verific: 85 + 110 + 255 = 450 jucarii au strans elevii clasei a IV-a
Raspuns: 85, 110, 255
prima saptamana l------l
a doua saptamana l------l+ 25 } total = 450 jucarii
a treia saptamana l------l------l------l
450 - 25 = 425 → suma celor 5 parti egale
425 : 5 = 85 jucarii au strans in prima saptamana
85 + 25 = 110 jucarii au strans in a doua saptamana
3 x 85 = 255 jucarii au strans in a treia saptamana
Verific: 85 + 110 + 255 = 450 jucarii au strans elevii clasei a IV-a
Raspuns: 85, 110, 255