Question

Реши задачи .вычисли и запиши ответ.на катке было 45детей .с катки ушли несколько девочек и 17. мальчиков.на катке осталось 19мальчиков и 3 девочки .сколько девочек ушли с катки?

Answer 1

1)17+19=36 (мальчиков ) было на катке
2) 45-36=9 (девочкек) было на катке
3)9-3=6 (девочкек) ушли с катка
ответ :6 девочек

Answer 2

45-17=28
19+3=22
28-22=6 девочек ушло

Answer 3

Problem Analysis

We are given that there were initially 45 children at the skating rink. Some girls and 17 boys left the rink, and there were 19 boys and 3 girls left. We need to determine how many girls left the rink.

Solution

Let's assume the number of girls who left the rink is represented by 'x'.

We know that the total number of children at the rink initially was 45. Therefore, the equation representing the initial number of children can be written as:

45 = x (number of girls) + 17 (number of boys)

We also know that after some children left, there were 19 boys and 3 girls left. Therefore, the equation representing the number of children left can be written as:

22 = 3 (number of girls left) + 19 (number of boys left)

We can solve this system of equations to find the value of 'x', which represents the number of girls who left the rink.

Let's solve the equations:

Equation 1: 45 = x + 17 Equation 2: 22 = 3 + 19

Simplifying Equation 1, we get: x = 45 - 17 x = 28

Therefore, 28 girls left the rink.

Answer

The number of girls who left the skating rink is 28.