The new owner of a student apartment building near campus was considering establishing a No Pets Rule. He decided to survey the urrent residents to see how many owned pets and what kind of pets they owned. THe building had 58 units. The previous owner had not allowed cats or dogs or other mammals, but the residents reported a variety of other pets: 30 owned birds; 38 owned fish; and 30 owned frogs, lizards, or snakes. Of those who had fish, 19 also had a frog, lizard, or snake. The owner had found that 18 had both fish and birds and 15 kept a bird and a frog, lizard, or snake. Lastly, he determined that 10 owned fish, a bird, and a frog, lizard, or snake. How many residents could have reported no pets?
The new owner of a student apartment building near campus was considering establishing a No Pets Rule. He decided to survey the urrent residents to see how many owned pets and what kind of pets they owned. THe building had 58 units. The previous owner had not allowed cats or dogs or other mammals, but the residents reported a variety of other pets: 30 owned birds; 38 owned fish; and 30 owned frogs, lizards, or snakes. Of those who had fish, 19 also had a frog, lizard, or snake. The owner had found that 18 had both fish and birds and 15 kept a bird and a frog, lizard, or snake. Lastly, he determined that 10 owned fish, a bird, and a frog, lizard, or snake. How many residents could have reported no pets?
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