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Mark has some money in his wallet. He was paid $8 for for working for an hour and then had a total of $15. How much money did he have in his wallet before working?

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Mark had $7 in his wallet before working.

15 - 8 = 7

We subtract the 8 dollars that he earned for working from the 15 dollars that he had in the end to find what he had at first.
User Johannes Schacht
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