In Exercises 21 and 22, use a Venn diagram like the one in Figure 2.35. A surve...

In Exercises 21 and 22, use a Venn diagram like the one in Figure 2.35.

A survey of 136 pet owners yielded the following information: 49 pet owners own fish; 55 own a bird; 50 own a cat; 68 own a dog; 2 own all four; 11 own only fish; 14 own only a bird; 10 own fish and a bird; 21 own fish and a cat; 26 own a bird and a dog; 27 own a cat and a dog; 3 own fish, a bird, a cat, and no dog; 1 owns fish, a bird, a dog, and no cat; 9 own fish, a cat, a dog, and no bird; and 10 own a bird, a cat, a dog, and no fish. How many of the surveyed pet owners have no fish, no birds, no cats, and no dogs? (They own other types of pets.)