31 plus what equals 72?

This is how to calculate "31 plus what equals 72?" In other words, 31 plus a number equals 72. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

31 + what = 72

To solve this equation, we first add -31 to each side of the equal sign like this:

31 - 31 + what = 72 - 31

Then, we do the calculation to get the answer to "31 plus what equals 72?" as follows:

What = 41

The answer to "31 plus what equals 72?" is 41. You know this answer is correct because 31 plus 41 equals 72.

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31 plus what equals 73?
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