To find out how much money Jeff has left after spending three-eighths of his $20, we can follow these steps:
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Calculate how much he spent: \[ \text{Amount spent} = \frac{3}{8} \times 20 = \frac{60}{8} = 7.5 \]
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Subtract the amount spent from his total money: \[ \text{Amount left} = 20 - 7.5 = 12.5 \]
So, Jeff has $12.50 left.