To calculate the percent decrease from 25 to 15, you can use the following formula:
\[ \text{Percent Decrease} = \left( \frac{\text{Original Value} - \text{New Value}}{\text{Original Value}} \right) \times 100 \]
In this case, the Original Value is 25 and the New Value is 15.
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Subtract the new value from the original value: \[ 25 - 15 = 10 \]
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Now, divide the difference by the original value: \[ \frac{10}{25} = 0.4 \]
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Finally, multiply by 100 to get the percentage: \[ 0.4 \times 100 = 40 \]
Thus, the percent decrease from 25 to 15 is 40.0%.
So, the final answer rounded to the nearest tenth is:
\[ \boxed{40.0} \]
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