What two numbers add up to 1220?

There are infinite combinations of two numbers that add up to 1220. Here are some examples using negative numbers:

-1 + 1221 = 1220
-2 + 1222 = 1220
-3 + 1223 = 1220
...

Here are some examples using two fractions that will add up to 1220:

1220/2 + 1220/2 = 1220
2440/3 + 1220/3 = 1220
3660/4 + 1220/4 = 1220
...

And here are some examples using two decimal numbers that will add up to 1220:

1.25 + 1218.75 = 1220
2.50 + 1217.5 = 1220
3.75 + 1216.25 = 1220
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 1220?", 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 1220. (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 1220?" has 610 answers:

1 + 1219 = 1220
2 + 1218 = 1220
3 + 1217 = 1220
.
.
608 + 612 = 1220
609 + 611 = 1220
610 + 610 = 1220

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 1220 by 2 and then rounded down to the nearest whole number if necessary.

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