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Bunuel
In a survey of 500 students regarding pet ownership of cats and dogs, c students own at least one cat, d students own at least one dog, and b students own at least one dog and at least one cat. How many students own neither a cat nor a dog?

(A) 500 - c - d + b
(B) 500 - c - d - b
(C) 500 - c + d
(D) 500 - c - d
(E) 500 - b

We can create the equation:

Total = own a dog + own a cat - both + neither

500 = d + c - b + neither

500 - d - c + b = neither

Answer: A
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