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17 April, 10:20

When buddy discovers the revolving door, he goes 4 complete revolutions in 11 seconds. How many times around would he go if he continued at this rate for a full minute

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  1. 17 April, 10:45
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    To figure out how many revolutions Buddy goes in 1 minute, (60 seconds) we can use proportions

    4 revolutions/11 seconds = x revolutions/60 seconds

    When we cross multiply, (multiplying one numerator by the other denominator, and vice versa for the other numerator) we get

    240 = 11x

    divide both sides by 11 to get

    21.81 = x

    or 21 complete revolutions
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