77 plus what equals 91?

This is how to calculate "77 plus what equals 91?" In other words, 77 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:

77 + what = 91

To solve this equation, we first add -77 to each side of the equal sign like this:

77 - 77 + what = 91 - 77

Then, we do the calculation to get the answer to "77 plus what equals 91?" as follows:

What = 14

The answer to "77 plus what equals 91?" is 14. You know this answer is correct because 77 plus 14 equals 91.

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77 plus what equals 92?
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