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The table below shows the enrollment in various classes at a certain college..Although no student is enrolled in all three classes, 15 are enrolled in both Biology and Physics, 10 are enrolled in both Biology and Calculus, and 12 are enrolled in both Physics and Calculus. How many different students are in the three classes?

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The table below shows the enrollment in various classes at a certain college.<br><img alt='Images' src='https://www.fatskills.com/images3/gmat/t0031-01.jpg'><br>.Although no student is enrolled in all three classes, 15 are enrolled in both Biology and Physics, 10 are enrolled in both Biology and Calculus, and 12 are enrolled in both Physics and Calculus. How many different students are in the three classes?






 
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