Math Problem Statement

A pet store surveyed 649 people to see how many own a fish, how many own a cat, and how many own a bird. The Venn diagram below shows the results. (Each number gives the number of people who fall into that Venn diagram category.)

Solution

Let's analyze the Venn diagram and answer the questions:

Given Information:

  • The Venn diagram shows the survey results for 649 people.
  • Each number in the Venn diagram represents how many people fall into each category.

Step-by-Step Analysis:

  1. People who own exactly one type of animal:

    • These are the people who are in only one category:
      • Own only a fish: 4747
      • Own only a cat: 3838
      • Own only a bird: 102102
    • Total for exactly one type: 47+38+102=18747 + 38 + 102 = 187.

    Answer (a): 187 people.

  2. People who own a cat (including all combinations that involve a cat):

    • Own only a cat: 3838
    • Own a cat and a fish: 135135
    • Own a cat and a bird: 5454
    • Own all three: 6868
    • Total owning a cat: 38+135+54+68=29538 + 135 + 54 + 68 = 295.

    Answer (b): 295 people.

  3. People who own both a bird and a fish, but don’t own a cat:

    • This category is represented by the number 123123 in the Venn diagram.

    Answer (c): 123 people.

Let me know if you have questions or need a deeper explanation!

Here are 5 related questions you might find interesting:

  1. How many people own a fish?
  2. How many people own both a cat and a bird, but not a fish?
  3. How many people own at least one type of animal?
  4. How many people own exactly two types of animals?
  5. How many people do not own any pets?

Tip: Venn diagrams are a great tool for visualizing and solving problems involving sets and overlaps!

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Math Problem Analysis

Mathematical Concepts

Set Theory
Venn Diagrams
Survey Analysis

Formulas

People with exactly one type of pet: Fish only + Cat only + Bird only
People who own a cat: Sum of all regions involving a cat
People with both bird and fish, but not a cat: Single region count

Theorems

Inclusion-Exclusion Principle: Used for calculating intersections between sets

Suitable Grade Level

Grades 6-9