Question

Бабушка вышла во двор и позвала к себе всех своих кур и своего кота.Все они прибежали к ней,а всего к бабушке прибежало 20 ног.Сколько кур у бабушки? А)11; Б)9; В)8; Г)6; Д)4

Answer 1

Считай всего 20 ног. у кота 4 ноги а значит 
20-4=16(ног) - все оги у кур.
16:2=4(курицы)-у бабушки.
ответ: 4 

Answer 2

В)8
20 ног всего. Кот - минус 4 лапы. Остаётся 16. У кур по 2 лапы. Делим 16 на 2 получаем 8

Answer 3

Problem Analysis

The problem states that the grandmother went out into the yard and called all her chickens and her cat. When they all came to her, there were a total of 20 legs. We need to determine how many chickens the grandmother has.

Solution

Let's assume that the grandmother has x chickens and 1 cat. Each chicken has 2 legs, and the cat has 4 legs. So the total number of legs can be expressed as:

2 * x + 4 * 1 = 20

Simplifying the equation:

2x + 4 = 20

Subtracting 4 from both sides:

2x = 16

Dividing both sides by 2:

x = 8

Therefore, the grandmother has 8 chickens.

Answer

The answer is В) 8.