Cake
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    • I thought briefly about the two linear equations; but I realized by the time I wrote them out and solved them - like you I need paper and a pencil to parse them out - I already had my answer by inspection.

      I always say it is good to know more than just one way to skin a cat.

    • I started with the fact that he could not have ten dimes or more, therefore any number greater than 5 had to be wrong.

      Then I calculated B and it was correct.