Question

Среди 100 туристов, посетивших Италию, 70 посетили Рим, 35 посетили Венецию, а 25 посетили и Рим, и Венецию. Сколько туристов из этой группы не посетили ни Рим, ни Венецию?

Answer 1

70-25=45    туристов  посетили только Рим
35-25=10  только Венецию
45+10+25  побывали в Риме или Венеции или и там т там.
80 туристов побывали  хотя бы в одном городе.
100-80=20  не были ни в Риме ни в Венеции.
Ответ: 20 туристов.

Answer 2

Надо 100-70равно 30 35-30равно 5 25-5равно20

Answer 3

Calculating the Number of Tourists Who Did Not Visit Rome or Venice

To calculate the number of tourists who did not visit Rome or Venice, we can use the principle of inclusion and exclusion. We'll start by determining the number of tourists who visited either Rome or Venice and then subtract that from the total number of tourists.

Given: - Total tourists = 100 - Tourists visited Rome = 70 - Tourists visited Venice = 35 - Tourists visited both Rome and Venice = 25

Let's calculate the number of tourists who did not visit Rome or Venice.

Calculation

1. Total tourists who visited Rome or Venice: - Tourists visited Rome = 70 - Tourists visited Venice = 35 - Tourists visited both Rome and Venice = 25 - Total tourists who visited Rome or Venice = Tourists visited Rome + Tourists visited Venice - Tourists visited both Rome and Venice - Total tourists who visited Rome or Venice = 70 + 35 - 25 - Total tourists who visited Rome or Venice = 80

2. Number of tourists who did not visit Rome or Venice: - Total tourists = 100 - Number of tourists who visited Rome or Venice = 80 - Number of tourists who did not visit Rome or Venice = Total tourists - Number of tourists who visited Rome or Venice - Number of tourists who did not visit Rome or Venice = 100 - 80 - Number of tourists who did not visit Rome or Venice = 20

Therefore, 20 tourists from this group did not visit either Rome or Venice.

Conclusion

Out of the 100 tourists, 20 did not visit Rome or Venice.