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Posted by on Tuesday, July 22, 2008 at 5:50pm.

AB+CD=AAA

What is the value of C?


Choices: 1, 3, 7, 9, or N/A

  • math - , Wednesday, July 23, 2008 at 7:04am

    Easier if you write it as

    _AB
    _CD+
    ____
    AAA

    The largest A+C can be is 18 (1 carried plus say A or C=9 and A or C=8) so A must =1 (it can't=0)

    re-write

    _1B
    _CD+
    ____
    111

    In order for 1+C=11, C =9 with 1 carried from B+D.

    We don't need to know what B and D are.

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