What two numbers add up to 7920?

There are infinite combinations of two numbers that add up to 7920. Here are some examples using negative numbers:

-1 + 7921 = 7920
-2 + 7922 = 7920
-3 + 7923 = 7920
...

Here are some examples using two fractions that will add up to 7920:

7920/2 + 7920/2 = 7920
15840/3 + 7920/3 = 7920
23760/4 + 7920/4 = 7920
...

And here are some examples using two decimal numbers that will add up to 7920:

1.25 + 7918.75 = 7920
2.50 + 7917.5 = 7920
3.75 + 7916.25 = 7920
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 7920?", 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 7920. (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 7920?" has 3960 answers:

1 + 7919 = 7920
2 + 7918 = 7920
3 + 7917 = 7920
.
.
3958 + 3962 = 7920
3959 + 3961 = 7920
3960 + 3960 = 7920

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 7920 by 2 and then rounded down to the nearest whole number if necessary.

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