72 plus what equals 91?

This is how to calculate "72 plus what equals 91?" In other words, 72 plus a number equals 91. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

72 + what = 91

To solve this equation, we first add -72 to each side of the equal sign like this:

72 - 72 + what = 91 - 72

Then, we do the calculation to get the answer to "72 plus what equals 91?" as follows:

What = 19

The answer to "72 plus what equals 91?" is 19. You know this answer is correct because 72 plus 19 equals 91.

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72 plus what equals 92?
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