Question

СРОЧНО!!! В семье 9 детей и 2 родителей.Средний возраст всех детей составляет 6 лет,а средний возраст всех членов семьи-12 лет.каков средний возраст родителей?

Answer 1

(9*6+2*х)/(9+2)=12
(54+2х)/11=12
54+2х=12*11
54+2х=132
2х=132-54
2х=78
х=78:2=39 лет

Answer 2

Calculation of the Average Age of Parents

To find the average age of the parents in a family with 9 children and 2 parents, we can use the given information about the average age of all the children and the average age of all the family members.

Let's denote the average age of all the children as C and the average age of all the family members as F.

According to the given information: - The average age of all the children is 6 years. - The average age of all the family members is 12 years.

We can set up the following equations:

1. The total age of all the children divided by the number of children equals the average age of all the children: - C = (Total age of all the children) / (Number of children) - C = (9 children *

Answer 3

Я могу помочь вам решить эту задачу.

Пусть x - средний возраст родителей. Тогда по условию задачи можно составить следующее уравнение:

$$\frac{9 \times 6 + 2x}{11} = 12$$

Решая это уравнение, получаем:

$$x = \frac{132 - 54}{2} = 39$$

Ответ: средний возраст родителей равен 39 лет.