3 more than twice a number is 312

The number (x) in: "3 more than twice a number is 312" is what we are solving here.

In other words, you are looking for a number (x) that if you multiply it by two (same as twice) and then add 3, you get 312.

To solve this, you first write the problem as an algebra equation as follows: 2x + 3 = 312

Then you solve the equation by subtracting 3 from both sides, and then divide both sides by 2. Here is the math to illustrate better:

2x + 3 = 312

2x + 3 - 3 = 312 - 3
2x = 309

2x/2 = 309/2
x = 154.5

Answer = 154.5

The answer above is correct, because twice 154.5 is 309, and 3 more than 309 is in fact 312.

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