Question

Среднее арифметическое трех чисел равно 23. Одно число равно 6, второе 12. Найдите третье число

Answer 1

Найдем сумму трех чисел 23*3=69
Теперь найдем третье число 69-12-6=51

Answer 2

To find the third number, we can use the formula for the arithmetic mean (average):

Average = (Sum of all numbers) / (Number of numbers)

In this case, we have three numbers whose average is 23. Two of the numbers are given: 6 and 12. Let's represent the third number as "x".

So, the sum of all three numbers is 3 * 23 (average) = 69.

Now, we can set up an equation to find the third number:

6 + 12 + x = 69

Combine the first two numbers:

18 + x = 69

Now, isolate "x" by subtracting 18 from both sides of the equation:

x = 69 - 18

x = 51

The third number is 51.