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7 March, 16:19

durning a five year period, 65% of snowstorms in a certain city caused power outages. twenty-one of the snowstorms did not cause power outages. Find the total number of snowstorms in thid city over the five year period.

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  1. 7 March, 19:32
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    The total number of snowstorms is 60.

    If 65% caused power outages, then the 21 storms that didn't represent 35% because 65%+35%=100%. You can set up a proportion (35/100=21/?) and use cross multiplication to find the total number of snowstorms. So, 21x100=2,100 and then 2,100 divided by 35 is 60.
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