What three numbers have an average of 15?
Part 1: Understanding the Problem
We're looking for three numbers whose average is 15. This means if we add these three numbers together and divide by 3, we should get 15.
Step-by-step Solution:
- Recall the average formula: Average = (Sum of numbers) / (Count of numbers)
- In this case: 15 = (x + y + z) / 3
- To find the sum, multiply both sides by 3: 15 * 3 = x + y + z
- So, the sum of our three numbers should be: 45
Part 2: Finding Solutions
Now, let's find multiple sets of three numbers that add up to 45.
Solution 1:
15, 15, 15
Verification:
(15 + 15 + 15) / 3 = 45 / 3 ≈ 15
This solution is correct!
Solution 2:
15, 15, 15
Verification:
(15 + 15 + 15) / 3 = 45 / 3 ≈ 15
This solution is correct!
Solution 3:
23, 15, 7
Verification:
(23 + 15 + 7) / 3 = 45 / 3 ≈ 15
This solution is correct!
Solution 4:
3, 25, 17
Verification:
(3 + 25 + 17) / 3 = 45 / 3 ≈ 15
This solution is correct!
Solution 5:
43, 1, 1
Verification:
(43 + 1 + 1) / 3 = 45 / 3 ≈ 15
This solution is correct!
Explanation:
As you can see, there are many possible solutions. We can find more by:
- Choosing any two numbers
- Subtracting their sum from 45 to get the third number
Remember:
- The numbers don't have to be whole numbers.
- They can even be negative (although that might not make sense in some real-world contexts).
- The order of the numbers doesn't matter for the average.