What two numbers add up to 2640?

There are infinite combinations of two numbers that add up to 2640. Here are some examples using negative numbers:

-1 + 2641 = 2640
-2 + 2642 = 2640
-3 + 2643 = 2640
...

Here are some examples using two fractions that will add up to 2640:

2640/2 + 2640/2 = 2640
5280/3 + 2640/3 = 2640
7920/4 + 2640/4 = 2640
...

And here are some examples using two decimal numbers that will add up to 2640:

1.25 + 2638.75 = 2640
2.50 + 2637.5 = 2640
3.75 + 2636.25 = 2640
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 2640?", 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 2640. (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 2640?" has 1320 answers:

1 + 2639 = 2640
2 + 2638 = 2640
3 + 2637 = 2640
.
.
1318 + 1322 = 2640
1319 + 1321 = 2640
1320 + 1320 = 2640

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 2640 by 2 and then rounded down to the nearest whole number if necessary.

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