In the city of San Durango, 50 people own cats, dogs, or rabbits. If 20 people owned cats, 30 owned dogs, 30 owned rabbits, and 20 owned exactly two of the three types of pet, how many people owned all three?  Options:
A) 2  B) 4  C) 8  D) 5  E) 12
Total = C + 5 + R - (C5 + 5R + CR) - 2C5R   50 = 20 + 30 + 30 - (20) - 2x   x = 5   So, answer will be 5
<result>D</result>
In the city of San Durango, 50 people own cats, dogs, or rabbits. If 20 people owned cats, 30 owned dogs, 30 owned rabbits, and 20 owned exactly two of the three types of pet, how many people owned all three?