The average age of a grandmother, a grandfather, and 7 grandchildren is 28. The average age of 7 grandchildren is 15 years. How old is the grandfather, if he is 3 years older than the grandmother?
A: 72
B: 73
C: 74
D: 75
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Posted by: "Adeena Humayun" <adeenahumayun@gmail.com>
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