Ma = ( a + b + c ) : 3 = 28
a + b + c = 3 × 28 = 84 → suma celor 3 numere
Ma = ( b + c ) : 2 = 22,5
b + c = 2 × 22, 5 = 45 → suma ultimelor doua numere
a)
84 - 45 = 39 → primul numar
b) b = 2 c / 5
2 c / 5 + c = 45
2 c + 5 c = 5 × 45
7 c = 225 ⇒ c = 225 : 7 = 32,14
b = 2 ×32,14 / 5 = 12,85
