Respuesta :

Answer:

A = 18

Step-by-step explanation:

A is a multiple of 6, that is

A : 6, 12, 18, 24, 30, .......

Listing the factors gives

6 : 1, 2, 3, 6 → sum = 12

12 : 1, 2, 3, 4, 6, 12 → sum = 28

18 : 1, 2, 3, 6, 9, 18 → sum = 39

Thus A = 18

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