Answer:
B
Explanation:
12.5x3=37.5
37.5 +11.5 =49
49÷4 =12.25
D) 14
12+12+12 is 36 we don't know hold old the fourth sibling is so they are X
to get the average of 12.5 you need to add all the siblings ages then divide it by 4
(36+X)/4=14 so the other sibling is 14
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