Answer:
His sister will be 16 year old
Explanation:
46/2 = 23
15-8=7
23-7=16
16
father's age=46
half of father's age=46/2=23
Xiao's age=15
so when Xiao is half of her father age =23-15=8
then add 8 to his sister's age
so 8+8=16
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