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26 September, 21:26

Each of 15 students will give a 1 1/2 minute speech in English class. Suppose the teacher begins recording on a digital camera with an hour available. Show that ther's enough time to record everyone if she gives a 15 minute introduction at the begginning of class and every student takes a minute to get ready. How much time is left on the digital camera?

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  1. 26 September, 21:34
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    8 1/2 1 1/2•15 = 45/2 = 22 1/2+15=37 1/2+15=52 1/2 60-52 1/2 = 8 1/2 minutes
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