
This is how to calculate "78 plus what equals 47?" In other words, 78 plus a number equals 47. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:
78 + what = 47
To solve this equation, we first add -78 to each side of the equal sign like this:
78 - 78 + what = 47 - 78
Then, we do the calculation to get the answer to "78 plus what equals 47?" as follows:
What = -31
The answer to "78 plus what equals 47?" is -31. You know this answer is correct because 78 plus -31 equals 47.
78 plus what equals 48?
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