1. There are 220 people.54 of them have hamsters only.34 have hamsters and dogs. 15 have hamsters and cats.23 have cats and dogs.48 have dogs only.

a. How many people have cats only?

b. How many people have all three pets?

c. How many people have dogs (only or with something else)?

d. How many people have no classes?

2. There are students learning languages.54 learn Spanish only.19 learn Spanish and French.97 learn Portuguese with or without something else.15 learn Portuguese and Spanish.35 learn all three.12 learn Portuguese and French.30 learn nothing.

a. How many students learn Portuguese only?

b. How many students learn French only?

c. How many students are there?

3. There are students who are taking classes.25 are taking anthropology only.5 are taking anthropology and paleontology.15 are taking anthropology and geology.43 are taking paleontology only.8 are taking paleontology and geology.21 are taking geology only.

a. How many students are taking all three?

b. How many students are there?

c. How many students are taking paleontology with or without another class?