What two numbers add up to 8120?

There are infinite combinations of two numbers that add up to 8120. Here are some examples using negative numbers:

-1 + 8121 = 8120
-2 + 8122 = 8120
-3 + 8123 = 8120
...

Here are some examples using two fractions that will add up to 8120:

8120/2 + 8120/2 = 8120
16240/3 + 8120/3 = 8120
24360/4 + 8120/4 = 8120
...

And here are some examples using two decimal numbers that will add up to 8120:

1.25 + 8118.75 = 8120
2.50 + 8117.5 = 8120
3.75 + 8116.25 = 8120
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 8120?", it may be more interesting to set some criteria to limit the result. We will set the follow criteria:

1) Only positive whole numbers can add up to 8120. (0 is not a positive or negative number and should not be included.)

2) Since a+b=29 is the same as b+a=29, we should only list it once.

Now, the answer to "What two numbers add up to 8120?" has 4060 answers:

1 + 8119 = 8120
2 + 8118 = 8120
3 + 8117 = 8120
.
.
4058 + 4062 = 8120
4059 + 4061 = 8120
4060 + 4060 = 8120

We have truncated the list above due to space, but you may be interested to know that we calculated the number of answers by dividing 8120 by 2 and then rounded down to the nearest whole number if necessary.

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