A class counts the number of vehicles that pass by its school from 1 :00 to 2:00 pm there are 3 times as many cars as trucks
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If 19 out of 28 renters keep a pet, there are renters who don't keep a pet.
Whenever you have a subset of some set, and you want to know which percentage of the set the subset represents, you simply have to compute
So, in your case, you're wondering what percentage of 28 does 9 represent. So, the formula becomes