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There are 30 students in mr.hollands music class. if 30% of the students play in the school band, how many students in the class play in th school band

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CoffeeHead
30 students, or 100% are in Mr. Holland's music class. 

30% of 30 play in a school band.

[NOTE: How to calculate percentage of something]
*100% times 0.[%]*

30 times 0.30 = 9.

Answer: 9 students play in a school band.

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