Question

В одном городе 20% семей, имеющих кошек, имеют также и собак, 25% семей, имеющих собак, имеют также и кошек, а 20% всех семей не имеют ни кошек, ни собак. Сколько семей в этом городе имеют и кошек, и собак?

Answer 1

Пусть число x-число семей,имеют кошек,а y-число семей с собаками
10%-ответ

Answer 2

Calculation of Families with Both Cats and Dogs

To determine the number of families in the city that have both cats and dogs, we can use the information provided in the question. According to the question, 20% of families that have cats also have dogs, and 25% of families that have dogs also have cats. Additionally, 20% of all families in the city do not have either cats or dogs.

Let's assume there are a total of 100 families in the city for ease of calculation.

Out of these 100 families: - 20% have cats and dogs (both). - 20% have neither cats nor dogs. - The remaining families have either cats or dogs, but not both.

Let's calculate the number of families that have both cats and dogs:

- 20% of families have both cats and dogs: 20% of 100 families = 20 families.

Therefore, in this city, there are 20 families that have both cats and dogs.

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