What two numbers add up to 6215?

There are infinite combinations of two numbers that add up to 6215. Here are some examples using negative numbers:

-1 + 6216 = 6215
-2 + 6217 = 6215
-3 + 6218 = 6215
...

Here are some examples using two fractions that will add up to 6215:

6215/2 + 6215/2 = 6215
12430/3 + 6215/3 = 6215
18645/4 + 6215/4 = 6215
...

And here are some examples using two decimal numbers that will add up to 6215:

1.25 + 6213.75 = 6215
2.50 + 6212.5 = 6215
3.75 + 6211.25 = 6215
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 6215?", 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 6215. (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 6215?" has 3107 answers:

1 + 6214 = 6215
2 + 6213 = 6215
3 + 6212 = 6215
.
.
3105 + 3110 = 6215
3106 + 3109 = 6215
3107 + 3108 = 6215

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 6215 by 2 and then rounded down to the nearest whole number if necessary.

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What two numbers add up to 6216?
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