If you double a number and add 5 to the result, then that's 20 more than half of the original number. What's the original number?
Use reasoning to answer the following question.
4
Let x be the original number.

2 * x + 5 = 20 + x / 2.

2 * x - x / 2 = 15.

4 * x - x = 30.

3 * x = 30.

x = 10.

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The final answer: 4