What minus 90 equals 91?

Here we will show you how to calculate "What minus 90 equals 91?" using simple algebra.
For the sentence, "What minus 90 equals 91?", we can make it into an algebra equation as follows:
X - 90 = 91
Then, we solve for X. To solve for X, add 90 to both sides:
X - 90 + 90 = 91 + 90
Which makes:
X = 181
Thus, the answer to "What minus 90 equals 91?" is 181 as illustrated below:
181 - 90 = 91