Răspuns:
Explicație pas cu pas:
Metoda 1:
Natasa ______
Serioja ______ ______ ______ ______ ______
Vania ______ ______ ______ ______ ______ - 80 RON
Total = 272 RON = 11 parti egale - 80 RON
11 parti egale = 272 + 80 = 352 RON
1 parte = 352 : 11 = 32 RON
Natasa = 32 RON
Serioja = 5 x 32 = 160 RON
Vania = 160 - 80 = 80 RON
___________________
Metoda 2:
V + S + N = 272
S = V + 80
S = 5N
V = S - 80 = 5N - 80
________
5N - 80 + 5N + N = 272
11N = 272 + 80 = 352
N = 352 : 11 = 32 RON are Natasa
S = 5*32 = 160 RON are Serioja
V = 160 - 80 = 80 RON are Vania