Question

В мастерскую школы привезли 28 сломанных стульев с одной, двумя и тремя ножками. Ребята насчитали всего 51 ножку. Сколько стульев с тремя ножками принесли в мастерскую, если стульев с одной ножкой столько, сколько стульев с тремя и двумя ножками вместе.

Answer 1

Поехали.
х - стулья с 2-мя ножками
у - стулья с 3-мя ножками
Из условия задачи имеем х+у+14=28
Так как стульев с одной ножкой было 14, то на остальные стулья приходится 
51-14=37 ножек.
Система уравнений:
2х+3у=37
х+у=14

Решать не буду и так все понятно. Писать много.
В итоге у=9 стульев с 3-мя ножками, х=2 с 2-мя. Ну и 14 с одной. Для проверки по ножкам.

Answer 2

Problem Analysis

In this problem, we are given that 28 broken chairs were brought to a workshop school. These chairs have one, two, or three legs. The total number of legs counted by the children is 51. We need to determine how many chairs with three legs were brought to the workshop, given that there are as many chairs with one leg as there are chairs with three legs and two legs combined.

Solution

Let's assume the number of chairs with one leg is x. Since there are as many chairs with one leg as there are chairs with three legs and two legs combined, the number of chairs with three legs and two legs combined is also x.

We can set up the following equation based on the given information:

x + x + x = 51

Simplifying the equation, we get:

3x = 51

Dividing both sides by 3, we find:

x = 17

Therefore, there are 17 chairs with one leg, and the number of chairs with three legs is also 17.

Answer

The number of chairs with three legs brought to the workshop is 17.