24
Step-by-step explanation:
We need to state the positive factors of 12
They are: 1, 2, 3, 4, 6, 12
Then we take out the positive even factors of 12
They are: 2, 4, 6, 12
The sum of the positive even factors of 12 = 2+4+6+12
The sum of the positive even factors of 12 = 24