There are an infinite number of groups of three that all average 125.
Here are a few:
124, 125, 126
120, 125, 130
100, 125, 150
25, 125, 225
1, 125, 249
3, 73, 299
7, 183, 185
1, 2, 372
.
.
etc.
124, 125 and 126
The average is the sum of the numbers in the set divided by the number of numbers in the set. In this case it is (125+143+134)/3=134.
Well, let's take a moment to appreciate these lovely numbers. To find their average, you simply add them together and then divide by how many numbers you have. So, 125 + 115 + 108 equals 348. And when you divide 348 by 3, you get the average of these beautiful numbers, which is 116.
There can only be 3 of them because as a product of its prime factors: 5*5*5 = 125
They are: .1+.02+.005 = .125
They are: 2*5*11 = 110
125
Three different numbers that can equal 125 are 50, 40, and 35, since 50 + 40 + 35 = 125. Another example is 60, 30, and 35, which also sums to 125. There are countless combinations, as long as the numbers are distinct and their total is 125.
They are: 25+36+64 = 125
1 x 375, 3 x 125, 5 x 75, 15 x 25.
To get the simple average of a series of numbers, you add the numbers up and divide by however many numbers there were. For example, the average of 2, 3 and 4 is the sum of the numbers (which adds up to 9) divided by 3 (because there are three numbers). So the average is 9/3 = 3.
The average of 3, 3.5, and 6 is 4.17. Add the three numbers together and divide by 3 to find the average.