9 more than twice a number is 820

The number (x) in: "9 more than twice a number is 820" 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 9, you get 820.

To solve this, you first write the problem as an algebra equation as follows: 2x + 9 = 820

Then you solve the equation by subtracting 9 from both sides, and then divide both sides by 2. Here is the math to illustrate better:

2x + 9 = 820

2x + 9 - 9 = 820 - 9
2x = 811

2x/2 = 811/2
x = 405.5

Answer = 405.5

The answer above is correct, because twice 405.5 is 811, and 9 more than 811 is in fact 820.

More Than Twice a number
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9 more than twice a number is 821
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