What minus 40 equals 99?

Here we will show you how to calculate "What minus 40 equals 99?" using simple algebra.
For the sentence, "What minus 40 equals 99?", we can make it into an algebra equation as follows:
X - 40 = 99
Then, we solve for X. To solve for X, add 40 to both sides:
X - 40 + 40 = 99 + 40
Which makes:
X = 139
Thus, the answer to "What minus 40 equals 99?" is 139 as illustrated below:
139 - 40 = 99