Final answer:
The number of students in the music class decreased by 25%.
Step-by-step explanation:
To calculate the percent decrease in the number of students, we can use the formula:
Percent Decrease = ((Original Value - New Value) / Original Value) * 100
In this case, the original value is 16 and the new value is 12. Plugging these values into the formula, we get:
((16 - 12) / 16) * 100 = 25%
Therefore, the number of students in the music class decreased by 25%.
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