What two numbers add up to 1247?

There are infinite combinations of two numbers that add up to 1247. Here are some examples using negative numbers:

-1 + 1248 = 1247
-2 + 1249 = 1247
-3 + 1250 = 1247
...

Here are some examples using two fractions that will add up to 1247:

1247/2 + 1247/2 = 1247
2494/3 + 1247/3 = 1247
3741/4 + 1247/4 = 1247
...

And here are some examples using two decimal numbers that will add up to 1247:

1.25 + 1245.75 = 1247
2.50 + 1244.5 = 1247
3.75 + 1243.25 = 1247
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 1247?", 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 1247. (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 1247?" has 623 answers:

1 + 1246 = 1247
2 + 1245 = 1247
3 + 1244 = 1247
.
.
621 + 626 = 1247
622 + 625 = 1247
623 + 624 = 1247

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 1247 by 2 and then rounded down to the nearest whole number if necessary.

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What two numbers add up to 1248?
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