The number (x) in: "9 more than three times a number is 810" 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 9, you get 810.
To solve this, you first write the problem as an algebra equation as follows: 3x + 9 = 810
Then you solve the equation by subtracting 9 from both sides, and then divide both sides by 3. Here is the math to
illustrate better:
3x + 9 = 810
3x + 9 - 9 = 810 - 9
3x = 801
3x/3 = 801/3
x = 267
Answer = 267
Note: All answers are rounded to the nearest two decimals.
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