Question 980699
10 1/3 + 25 3/4 = 10 4/12 + 25 9/12
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10 4/12 + 25 9/12 = 35 13/12
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35 13/12 = 36 1/12 
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Note that 1/12 of a year is 1 month, so
Susan's father is 36 yrs 1 month old