Fie a,b,c cele trei numere
Intre ele se stabilesc relatiile urmatoare:
[tex] \frac{a + b + c}{3} = 80[/tex]
[tex] \frac{a + b}{2} = 75[/tex]
[tex] \frac{b + c}{2} = 81[/tex]
a + b + c = 80 × 3 = 240
a + b = 75 × 2 = 150
b + c = 81 × 2 = 162
a = (a + b + c) - (b + c) = 240 - 162 = 78
c = (a + b + c) - (a + b) = 240 - 150 = 90
b = (a + b + c) - (a + c) = 240 - (78 + 90) = 240 - 168 = 72
