20. Think of a number.

Add 7.
Double the result.
Subtract 8.
Double the result.
Add 12.
Divide by 4.
Subtract 6.
Your answer will be the original number. Explain how this trick works.

If 20 is the answer, what is the question?

20 is not a question

no the questions number as in answer the questions 1 through 20 so 20 is the number in which they are on kid

This trick is a combination of mathematical operations that ultimately results in the original number you think of. Let's break down each step and see how it works:

1. Think of a number: You start by thinking of any number. Let's call it 'x'.

2. Add 7: You add 7 to the number you thought of, giving you 'x + 7'.

3. Double the result: Multiplying a number by 2 doubles its value. So, you multiply 'x + 7' by 2, which gives you '2(x + 7)'.

4. Subtract 8: Now, you subtract 8 from the previous result '2(x + 7)'. This gives you '2(x + 7) - 8'.

5. Double the result: Similar to step 3, you multiply the previous result by 2 again. So, you have '2(2(x + 7) - 8)'.

6. Add 12: Adding 12 to the previous result gives you '2(2(x + 7) - 8) + 12'.

7. Divide by 4: Next, you divide the current result by 4. This operation is the same as multiplying by 1/4. So, you have '(2(2(x + 7) - 8) + 12) / 4'.

8. Subtract 6: Finally, subtracting 6 from the previous result gives you '(2(2(x + 7) - 8) + 12) / 4 - 6'.

9. Your answer will be the original number: If you simplify the expression '(2(2(x + 7) - 8) + 12) / 4 - 6', you will realize that all the 'x' terms and constants cancel out. This means that the answer will be 'x', which is the original number you thought of.

Though the trick may seem complicated, it relies on algebraic simplification to eliminate all the added, subtracted, and multiplied terms, leaving only the original number as the final answer.