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25 October, 10:38

A rumour spreads exponentially through a college. 100 people have heard it by noon, and 200 by 1 p. m. How many people have heard it (a) by 3 p. m., (b) by 12.30 p. m., (c) by 1.45 p. rn.?

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  1. 25 October, 13:07
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    12:30 = 150

    1:45 = 275

    3:00 = 300
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