Explanation: We are given that: 32% of the snowstorms caused power outage This means that we can get the percentages of the snowstorms that did not cause power outage as follows: % of storms not causing outage = 100% - 32% = 68%
Now, we are given that the number of snowstorms that did not cause power outage is 51 Assuming that the total number of storms is x, the equation would be as follows: 68% * x = 51 0.68x = 51 x = 51 / 0.68 x = 75 storms
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.