Question

Пожалуйста, помогите решить задачу. В олимпиаде приняли участие 15 учеников. Это составило 20% всехпятиклассников. Сколько учащихся в пятых классах?

Answer 1

20%=0,2
15:0,2=75 учащихся в пятых классах

или тоже самое:
15*100:20=75

Answer 2

15х100:20=75 учащихся в пятых классах

Answer 3

Problem Analysis

We are given that 15 students participated in an Olympiad, and this represents 20% of all fifth-grade students. We need to determine the total number of students in the fifth grade.

Solution

Let's assume the total number of fifth-grade students is represented by the variable x.

According to the problem, 15 students participated in the Olympiad, which is 20% of all fifth-grade students. We can express this information as the equation:

15 = 0.2x

To find the value of x, we can solve this equation.

Solving the Equation

To solve the equation, we can divide both sides by 0.2:

15 / 0.2 = x

Simplifying the left side of the equation:

75 = x

Therefore, the total number of students in the fifth grade is 75.

Answer

There are 75 students in the fifth grade.