Respuesta :
Answer:
There are 13 families had a parakeet only
Step-by-step explanation:
* Lets explain the problem
- There are 180 families
- 67 families had a dog
- 52 families had a cat
- 22 families had a dog and a cat
- 70 had neither a cat nor a​ dog, and in addition did not have a​
 parakeet
- 4 had a​ cat, a​ dog, and a parakeet (4 is a part of 22 and 22 is a part
 of 67 and 520
* We will explain the Venn-diagram
- A rectangle represent the total of the families
- Three intersected circles:
 C represented the cat
 D represented the dog
 P represented the parakeet
- The common part of the three circle had 4 families
- The common part between the circle of the cat and the circle of the
 dog only had 22 - 4 = 18 families
- The common part between the circle of the dog and the circle of the
 parakeet only had a families
- The common part between the circle of the cat and the circle of the
 parakeet only had b families
- The non-intersected part of the circle of the dog had 67 - 22 - a =
 45 - a families
 had dogs only
- The non-intersected part of the circle of the cat had 52 - 22 - b = Â
 30 - b families
 had cats only
- The non-intersected part of the circle of the parakeet had c families
 had parakeets only
- The part out side the circles and inside the triangle has 70 families
- Look to the attached graph for more under stand
∵ The total of the families is 180
∴ The sum of all steps above is 180
∴ 45 - a + 18 + 4 + 30 - b + b + c + a + 70 = 180 ⇒ simplify
- (-a) will cancel (a) and (-b) will cancel (b)
∴ (45 + 18 + 4 + 30 + 70) + (-a + a) + (-b + b) + c = 180
∴ 167 + c = 180 ⇒ subtract 167 from both sides
∴ c = 180 - 167 = 13 families
* There are 13 families had a parakeet only
