Question

В классе 15 учеников.Когда спросили сколько учеников знает английский,руку поднимали 10 ,а на вопрос сколько учеников знает и английский и русский руку поднимали 8. Двое учеников руку не поднимали.а) сколько учеников знает только английский ?б) сколько учеников знает русский?в) сколько учеников знает только русский ?

Answer 1

1) 10 - 8 = 2 (ученика) - знают только английский язык

2) 15 - 2 (которые руку не поднимали) - 8 (которые знают и англ. и русс.) = 5 только русский

3) 8 (которые знают и англ. и русс.) + 5 (которые знают только русс.) = 13 (учеников) - знают русский язык

Answer 2

Если ничего не напутала:
а) 2
б) 13
в) 5

Answer 3

Given Information:

In a class of 15 students, 10 students raised their hands when asked how many of them know English, and 8 students raised their hands when asked how many of them know both English and Russian. Two students did not raise their hands.

Solution:

To find the number of students who know only English, we need to subtract the number of students who know both English and Russian from the total number of students who know English.

Let's calculate the answers to each question step by step:

a) How many students know only English? To find the number of students who know only English, we subtract the number of students who know both English and Russian from the total number of students who know English.

Total number of students who know English: 10 Number of students who know both English and Russian: 8

Number of students who know only English = Total number of students who know English - Number of students who know both English and Russian Number of students who know only English = 10 - 8 = 2

Therefore, 2 students know only English.

b) How many students know Russian? To find the number of students who know Russian, we subtract the number of students who know both English and Russian from the total number of students who know English.

Number of students who know both English and Russian: 8

Number of students who know Russian = Number of students who know both English and Russian Number of students who know Russian = 8

Therefore, 8 students know Russian.

c) How many students know only Russian? To find the number of students who know only Russian, we need to subtract the number of students who know both English and Russian from the total number of students who know Russian. Since we don't have this information, we cannot determine the exact number of students who know only Russian.

Therefore, we cannot determine the exact number of students who know only Russian.

In summary: a) 2 students know only English. b) 8 students know Russian. c) We cannot determine the exact number of students who know only Russian.

Please let me know if there is anything else I can help you with!