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Thread: Correct Age of Grandfather

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    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. #2
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    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. #3
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    yes, she is 72 i believe u





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