Question

Количество ног кур и баранов равно 40, а количество их голов -15.сколько кур и баранов? Пожалуйста решите и в виде уравнения

Answer 1

Раз количество голов 15, значит кур и баранов 15 (у всех по одной голове)
х куры
15-х бараны
2х+4(15-х)=40
2х+60-4х=40
-2х=-20
х=10кур
15-10=5 баранов

Answer 2

Problem Analysis

We are given that the total number of legs of chickens and sheep is 40, and the total number of heads is 15. We need to find the number of chickens and sheep.

Solution

Let's assume the number of chickens as x and the number of sheep as y.

From the given information, we can form two equations: 1. The total number of legs: 2x (legs of chickens) + 4y (legs of sheep) = 40 2. The total number of heads: x (chickens) + y (sheep) = 15

We can solve these equations to find the values of x and y.

Solving the Equations

Let's solve the equations using the substitution method.

From equation 2, we can express x in terms of y: x = 15 - y

Substituting this value of x in equation 1, we get: 2(15 - y) + 4y = 40

Simplifying the equation: 30 - 2y + 4y = 40 2y = 40 - 30 2y = 10 y = 10/2 y = 5

Substituting the value of y in equation 2, we get: x + 5 = 15 x = 15 - 5 x = 10

Answer

Therefore, the number of chickens is 10 and the number of sheep is 5.

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