Answer: 1 1/2 (B)
Explanation:
the reason the answer is 1 and 1/2 because 1/2 + 1/2 = 1 whole.
The oldest child is 13, and the youngest is 11 1/2.
11 + 1 = 12 and 1/2 + 1/2 = 1 so uhh yea
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