What two numbers add up to 7978?

There are infinite combinations of two numbers that add up to 7978. Here are some examples using negative numbers:

-1 + 7979 = 7978
-2 + 7980 = 7978
-3 + 7981 = 7978
...

Here are some examples using two fractions that will add up to 7978:

7978/2 + 7978/2 = 7978
15956/3 + 7978/3 = 7978
23934/4 + 7978/4 = 7978
...

And here are some examples using two decimal numbers that will add up to 7978:

1.25 + 7976.75 = 7978
2.50 + 7975.5 = 7978
3.75 + 7974.25 = 7978
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 7978?", 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 7978. (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 7978?" has 3989 answers:

1 + 7977 = 7978
2 + 7976 = 7978
3 + 7975 = 7978
.
.
3987 + 3991 = 7978
3988 + 3990 = 7978
3989 + 3989 = 7978

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 7978 by 2 and then rounded down to the nearest whole number if necessary.

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