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30 October, 02:19

George found that he blinked 85 times in 15 minutes. At this rate, how many seconds passed during 51 blinks

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  1. 30 October, 03:34
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    85 / 5 = 15

    15 / 5 = 3

    15 / 3 = 5

    3 / 3 = 1

    Therefore, he blinks 5 times a minute.

    60 / 5 = 12

    5 / 5 = 1

    Therefore, he blinks once every 12 seconds.

    51 / 1 = 51

    51

    X 12

    = 102

    + 510

    = 612

    Therefore, 612 seconds passed during 51 blinks.
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