Question

В классе учится менее 50 учеников.За контрольную работу седьмая часть учеников получила пятёрки,третья-четвёрки,половина-тройки.Остальные работы были оценины как неудволетворительные.Сколько было таких работ?

Answer 1

Число учеников должно быть кратно 7, 3 и 2
7*3*2=42 ученика в классе.
42/7=6 учеников получили 5
42/3=14 учеников получили 4
42/2=21 ученик получил 3

21+14+6=41 ученик
значит двойки получили 42-41=1 ученик

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Answer 2

Количество учеников в классе должно делится и на 7, и на 3, и на 2.
7*3*2= 42 ученика в классе
42:7= 6 работ, за которые ученики получили пятерки
42:3= 14 работ, за которые ученики получили четверки
42:2= 21 работ на тройки
42- (6+14+21)= 1 работа на 2

Answer 3

Number of Students in the Class

Based on the given information, there are fewer than 50 students in the class. However, the exact number of students is not provided.

Grades Distribution

According to the information given, the grades distribution for the test is as follows: - One-seventh of the students received a grade of five (пятёрки). - One-third of the students received a grade of four (четвёрки). - Half of the students received a grade of three (тройки). - The remaining works were assessed as unsatisfactory (неудовлетворительные).

Calculation of the Number of Unsatisfactory Works

To determine the number of works that were assessed as unsatisfactory, we need to calculate the number of students who received grades other than five, four, or three.

Let's assume there are N students in the class. According to the given information: - One-seventh of the students received a grade of five, which is equal to N/7 students. - One-third of the students received a grade of four, which is equal to N/3 students. - Half of the students received a grade of three, which is equal to N/2 students.

To calculate the number of unsatisfactory works, we need to subtract the sum of the students who received grades five, four, and three from the total number of students in the class.

The calculation can be expressed as: N - (N/7 + N/3 + N/2).

Simplifying the equation: N - (3N/21 + 7N/21 + 11N/21) N - (21N/21) N - N 0

Therefore, the number of works that were assessed as unsatisfactory is 0.

Conclusion

Based on the given information, there were no works that were assessed as unsatisfactory.