What two numbers add up to 1807?

There are infinite combinations of two numbers that add up to 1807. Here are some examples using negative numbers:

-1 + 1808 = 1807
-2 + 1809 = 1807
-3 + 1810 = 1807
...

Here are some examples using two fractions that will add up to 1807:

1807/2 + 1807/2 = 1807
3614/3 + 1807/3 = 1807
5421/4 + 1807/4 = 1807
...

And here are some examples using two decimal numbers that will add up to 1807:

1.25 + 1805.75 = 1807
2.50 + 1804.5 = 1807
3.75 + 1803.25 = 1807
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 1807?", 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 1807. (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 1807?" has 903 answers:

1 + 1806 = 1807
2 + 1805 = 1807
3 + 1804 = 1807
.
.
901 + 906 = 1807
902 + 905 = 1807
903 + 904 = 1807

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 1807 by 2 and then rounded down to the nearest whole number if necessary.

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What two numbers add up to 1808?
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