In the city of San Durango, 90 people own cats, dogs, or rabbits. If 60 people owned cats, 20 owned dogs, 40 owned rabbits, and 18 owned exactly two of the three types of pet, how many people owned all three?	Pick one: A) 1 B) 3 C) 6 D) 11 E) 12
Total = 6 + D + R - (6D + DR + 6R) - 26DR   90 = 60 + 20 + 40 - (18) - 2x   x = 6   So, answer will be 6
<result>C</result>
In the city of San Durango, 90 people own cats, dogs, or rabbits. If 60 people owned cats, 20 owned dogs, 40 owned rabbits, and 18 owned exactly two of the three types of pet, how many people owned all three?