The number (x) in: "1 more than three times a number is 400" is what we are solving here.
In other words, you are looking for a number (x) that if you multiply it by three (same as three times) and then add 1, you get 400.
To solve this, you first write the problem as an algebra equation as follows: 3x + 1 = 400
Then you solve the equation by subtracting 1 from both sides, and then divide both sides by 3. Here is the math to
illustrate better:
3x + 1 = 400
3x + 1 - 1 = 400 - 1
3x = 399
3x/3 = 399/3
x = 133
Answer = 133
Note: All answers are rounded to the nearest two decimals.
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