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There are infinitely many answers.

Let A be any whole number and let B = -A -20

Then by the closure of integers, B must be a whole number.

And A + B = A + (-A - 20) = -20

Since A is arbitrary, there are infinitely many ways of choosing A and so there are infinitely many ways in which two whole numbers will make -20.

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Q: What two whole numbers make -20?
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