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(a + b + c) / 3 = 13
a + b + c = 3 (13)
a + b + c = 39................(1)
(a + b) / 2 = 16
a + b = 2 (16)
a + b = 32...................(2)
Sustituyendo (2) en (1):
32 + c = 39
c = 39 - 32
c = 7
El número que quité vale 7
16+16+7=39
39÷3=13 y se quita el numero 7 pata que Dr el resultado.
16+16=32
32÷2=16