Question

В школьной олимпиаде по математике приняли участие 27 учащихся 5 - 7 классов это 60 % всех учащихся сколько членов кружков не участвовали в олимпиаде

Answer 1

27 уч - 60 %
х уч - 100 %

60х = 2700
х = 2700 : 60
х = 45 

Answer 2

Calculating the Number of Students in the School

To calculate the total number of students in the school, we can use the fact that 60% of all students participated in the math olympiad. Given that 27 students participated, we can calculate the total number of students in the school.

Total number of students in the school: To find the total number of students in the school, we can use the formula: \[ \text{Total number of students} = \frac{\text{Number of participating students}}{\text{Percentage of participating students}} \times 100 \]

\[ \text{Total number of students} = \frac{27}{0.60} \times 100 \]

\[ \text{Total number of students} = 45 \times 100 \]

\[ \text{Total number of students} = 450 \]

Number of Students Not Participating in the Olympiad

Now that we know the total number of students in the school, we can calculate the number of students who did not participate in the olympiad.

Number of students not participating in the olympiad: To find the number of students who did not participate in the olympiad, we can subtract the number of participating students from the total number of students in the school.

\[ \text{Number of students not participating} = \text{Total number of students} - \text{Number of participating students} \]

\[ \text{Number of students not participating} = 450 - 27 \]

\[ \text{Number of students not participating} = 423 \]

Therefore, 423 students did not participate in the olympiad.