Such a Deal!Math brain teasers require computations to solve.
A man received an ad in the mail that promised to double his money. For every dollar he sent in, the ad guaranteed to return double his money minus a $24 service charge. He thought that was a pretty good deal, so he sent in his money. In the return mail he received double his money less the $24 service charge. He returned the money he had made and again it was doubled less the service charge. But, when he sent in the money a third time, he was charged the $24 service fee, but received no money back. How much money did the man lose?
AnswerHe lost $21. Work backwards. If his last payment was doubled, less $24, it must have been $12. Payment two must have been $18, and payment one $21.
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