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A man puts a dollar under his bed on day 1, 2 dollars the next day, 3 dollars on day 3, and so on. After 15 days, he takes the stash and buys $100 worth of food. How much is left in the stash?

 Jan 8, 2020
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He should, after 15 days, have: [15 x 16] / 2 =$120.00

 

$120 - $100 = $20.00 left

 Jan 8, 2020

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