What two numbers add up to 7780?

There are infinite combinations of two numbers that add up to 7780. Here are some examples using negative numbers:

-1 + 7781 = 7780
-2 + 7782 = 7780
-3 + 7783 = 7780
...

Here are some examples using two fractions that will add up to 7780:

7780/2 + 7780/2 = 7780
15560/3 + 7780/3 = 7780
23340/4 + 7780/4 = 7780
...

And here are some examples using two decimal numbers that will add up to 7780:

1.25 + 7778.75 = 7780
2.50 + 7777.5 = 7780
3.75 + 7776.25 = 7780
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 7780?", 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 7780. (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 7780?" has 3890 answers:

1 + 7779 = 7780
2 + 7778 = 7780
3 + 7777 = 7780
.
.
3888 + 3892 = 7780
3889 + 3891 = 7780
3890 + 3890 = 7780

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 7780 by 2 and then rounded down to the nearest whole number if necessary.

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