What numbers add to 71?

Answer 1

There are infinitely many answers.

Start with two positie integers: 1 + 70, 2 + 69, 3 + 68, etc

Then allow negative integers: -1 + 72, -2 + 73, -3 + 74, etc

Next, introduce 1-digit decimals: 0.1 + 70.9, 0.2 + 70.8, etc

1.1 + 69.9, 1.2 + 69.8, etc

and then 2-digit decimals: 0.01 + 70.99, 0.02 + 70.98 etc

then Irrational Numbers: 1+sqrt(2) and 70-sqrt(2), 1+sqrt(3) and 70-sqrt(3) etc.

Now start again with sets of three numbers, and then 4 numbers, ...

You should have got the point by now.