To find out how much money Jeff has left after spending \( \frac{3}{8} \) of his $20, we first need to calculate how much he spent.
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Calculate \( \frac{3}{8} \) of $20: \[ \text{Amount spent} = \frac{3}{8} \times 20 = \frac{60}{8} = 7.5 \]
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Subtract the amount spent from the initial amount: \[ \text{Amount left} = 20 - 7.5 = 12.5 \]
So, Jeff has $12.50 left.