What two numbers add up to 9985?

There are infinite combinations of two numbers that add up to 9985. Here are some examples using negative numbers:

-1 + 9986 = 9985
-2 + 9987 = 9985
-3 + 9988 = 9985
...

Here are some examples using two fractions that will add up to 9985:

9985/2 + 9985/2 = 9985
19970/3 + 9985/3 = 9985
29955/4 + 9985/4 = 9985
...

And here are some examples using two decimal numbers that will add up to 9985:

1.25 + 9983.75 = 9985
2.50 + 9982.5 = 9985
3.75 + 9981.25 = 9985
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 9985?", 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 9985. (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 9985?" has 4992 answers:

1 + 9984 = 9985
2 + 9983 = 9985
3 + 9982 = 9985
.
.
4990 + 4995 = 9985
4991 + 4994 = 9985
4992 + 4993 = 9985

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 9985 by 2 and then rounded down to the nearest whole number if necessary.

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