Question: In a town where 60% of the citizens own a pet, half own a dog and 30 own a cat. How many citizens are in the town? Think carefully first, then make a decision:
Half the pet - owners have a cat because 1 - 1 / 2 = 1 / 2. There are 60 pet owners because 30 / (1 / 2) = 60. The town has 100 citizens because 60 / .6 = 100. So the answer is 100.