70 plus what equals 20?

This is how to calculate "70 plus what equals 20?" In other words, 70 plus a number equals 20. What is that number? We start by converting this word problem into an equation where "what" is what we want to solve:

70 + what = 20

To solve this equation, we first add -70 to each side of the equal sign like this:

70 - 70 + what = 20 - 70

Then, we do the calculation to get the answer to "70 plus what equals 20?" as follows:

What = -50

The answer to "70 plus what equals 20?" is -50. You know this answer is correct because 70 plus -50 equals 20.

Plus What Equals Calculator
Here you can calculate a similar problem:

70 plus what equals 21?
Do you think you can solve a similar problem on your own? Try to figure out the next problem on our list and then go here to check the answer.