Respuesta :

(60-15)/60*100=75%

Your answer is 75%
Now, if you read the problem to quickly, you would put B.
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But, if you read the problem, it says what percent did not wear orange shirts.
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25% did wear orange shirts, but it asks what percent did not.
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So, it would be 75%, because 15,30,45,60.
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Glad I could help, and good luck!
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