To solve this problem, we need to determine the value of x, which represents the age of one of the boys in the Gauss family.
Let's break down the information given:
Age of the girl: 14
Age of the boy: 15
Mean (average) of the ages of the children: 10
We can set up the equation as follows:
(Age of the first boy + Age of the second boy + Age of the third boy + Age of the girl + Age of the boy) / Total number of children = Mean (average) of the ages
(x + x + x + 14 + 15) / 5 = 10
Let's simplify and solve for x:
(3x + 29) / 5 = 10
To isolate x, we multiply both sides of the equation by 5:
5 * (3x + 29) / 5 = 10 * 5
3x + 29 = 50
To isolate x, we subtract 29 from both sides of the equation:
3x + 29 - 29 = 50 - 29
3x = 21
To solve for x, we divide both sides of the equation by 3:
x = 21 / 3
x = 7
The value of x is 7.
The answer is: 7
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
The Gauss family has three boys aged X a girl aged $14,$ and a boy aged $15. The mean (average) of the ages of the children is 10. What is the value of unknown variable X?

### Answer:
