What two numbers add up to 6420?

There are infinite combinations of two numbers that add up to 6420. Here are some examples using negative numbers:

-1 + 6421 = 6420
-2 + 6422 = 6420
-3 + 6423 = 6420
...

Here are some examples using two fractions that will add up to 6420:

6420/2 + 6420/2 = 6420
12840/3 + 6420/3 = 6420
19260/4 + 6420/4 = 6420
...

And here are some examples using two decimal numbers that will add up to 6420:

1.25 + 6418.75 = 6420
2.50 + 6417.5 = 6420
3.75 + 6416.25 = 6420
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 6420?", 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 6420. (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 6420?" has 3210 answers:

1 + 6419 = 6420
2 + 6418 = 6420
3 + 6417 = 6420
.
.
3208 + 3212 = 6420
3209 + 3211 = 6420
3210 + 3210 = 6420

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 6420 by 2 and then rounded down to the nearest whole number if necessary.

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