Ma ( x, y, z ) = ( x + y + z ) : 3 = 10 → media aritmetica
x + y + z = 3 × 10
x + y + z = 30 → suma celor trei numere
Ma ( y, z ) = ( y + z ) : 2 = 2
y + z = 2 × 2
y + z = 4 → suma ultimelor doua numere ( y si z )
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x + y + z = 30
x + 4 = 30
x = 30 - 4
x = 26
