Question

В пятом классе 26 учеников после того как раз пришли еще две девочки то количество девочек в 3 раза больше чем мальчиков сколько девочек было в начале

Answer 1

Пусть в классе было х мальчиков. Тогда девочек стало (28 - х). Составим уравнение:

3х = 28 - х
3х + х = 28
4х = 28
х = 7
Девочек стало 28 - 7 = 21
Девочек было 21 - 2 = 19
Ответ: изначально в классе было 19 девочек.

Answer 2

Problem Analysis

We are given that there are 26 students in the fifth grade, and after two more girls join, the number of girls is three times the number of boys. We need to determine the number of girls at the beginning.

Solution

Let's assume the number of boys at the beginning is x. After two more girls join, the number of girls becomes 3x. The total number of students is then x + 3x = 4x.

We are given that there are 26 students in total, so we can set up the equation 4x = 26 to solve for x.

Calculation

To find the value of x, we can divide both sides of the equation by 4: 4x / 4 = 26 / 4 x = 6.5

Since the number of students cannot be a decimal, we can conclude that our assumption is incorrect. Let's try a different approach.

Let's assume the number of girls at the beginning is y. After two more girls join, the number of girls becomes y + 2. The total number of students is then y + (y + 2) = 2y + 2.

We are given that there are 26 students in total, so we can set up the equation 2y + 2 = 26 to solve for y.

Calculation

To find the value of y, we can subtract 2 from both sides of the equation: 2y + 2 - 2 = 26 - 2 2y = 24

Next, we divide both sides of the equation by 2: 2y / 2 = 24 / 2 y = 12

Therefore, there were 12 girls at the beginning.

Answer

There were 12 girls in the fifth grade at the beginning.