# Thread: Correct Age of Grandfather

1. ## Correct Age of Grandfather

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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2. The total age of the grandmother, a grandfather and 7 grandchildren = 28 × 9 = 252

The total age of the 7 grandchildren = 15 × 7 = 105

Therefore the total age of the grandmother and grandfather = 252 - 105 = 147

If the grandfather is 3 years older than the grandmother, then he must be 75 and she is 72.

3. yes, she is 72 i believe u

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