What plus 37 equals 20?

This is how to calculate "What plus 37 equals 20?" In other words, what do you add to 37 to get 20? We start by converting this word problem into an equation where "What" is what we want to solve:

What + 37 = 20

To solve this equation, we first add -37 to each side of the equal sign like this:

What + 37 - 37 = 20 - 37

Then, we do the calculation to get the answer to "What plus 37 equals 20?" as follows:

What = -17

The answer to "What plus 37 equals 20?" is -17. You know this answer is correct because -17 plus 37 equals 20.

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What plus 37 equals 21?
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