During a 5-year period, 32% of snowstorms in a certain city caused power outage fifty-one of the snowstorms did not cause power outages. find the total number of snowstorms in this city over the 5-year period.

To answer this question you will consider that if 32% of the storms did cause outages, then 100% (all of them)-32%= 68% did NOT produce a power outage. We can say that 68% of the total is 51.

This can be written as 0.68 x = 51 where x is the total number of snowstorms. Divide both sides by 0.68 to solve for x. X = 75 snowstorms. Another way to do this is to use Ratios. See the attached page for the strategy.