Tuesday

July 22, 2014

July 22, 2014

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

What is the value of C?

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

- math -
**Dr Russ**, Wednesday, July 23, 2008 at 7:04amEasier 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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