What two numbers add up to 3120?

There are infinite combinations of two numbers that add up to 3120. Here are some examples using negative numbers:

-1 + 3121 = 3120
-2 + 3122 = 3120
-3 + 3123 = 3120
...

Here are some examples using two fractions that will add up to 3120:

3120/2 + 3120/2 = 3120
6240/3 + 3120/3 = 3120
9360/4 + 3120/4 = 3120
...

And here are some examples using two decimal numbers that will add up to 3120:

1.25 + 3118.75 = 3120
2.50 + 3117.5 = 3120
3.75 + 3116.25 = 3120
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 3120?", 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 3120. (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 3120?" has 1560 answers:

1 + 3119 = 3120
2 + 3118 = 3120
3 + 3117 = 3120
.
.
1558 + 1562 = 3120
1559 + 1561 = 3120
1560 + 1560 = 3120

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 3120 by 2 and then rounded down to the nearest whole number if necessary.

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What two numbers add up to 3121?
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