99 plus what equals 60?

This is how to calculate "99 plus what equals 60?" In other words, 99 plus a number equals 60. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

99 + what = 60

To solve this equation, we first add -99 to each side of the equal sign like this:

99 - 99 + what = 60 - 99

Then, we do the calculation to get the answer to "99 plus what equals 60?" as follows:

What = -39

The answer to "99 plus what equals 60?" is -39. You know this answer is correct because 99 plus -39 equals 60.

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99 plus what equals 61?
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