Posted by **Shay** on Friday, August 7, 2009 at 4:05pm.

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.

## Answer this Question

## Related Questions

- elementary - Think of a number. Add 7. Double the result. Subtract 8. Double the...
- arithmetic - How does this work “Think of a #. Add 7. Double the result. ...
- math - Think of a number. Add 17. Double the result.Subtract 4. Double the ...
- Algebra - Hello all! I had a quick homework question: I have to prove that the ...
- Algebra - Pick a number. Double it. Multiply the result by 3. Add 24. Divide by ...
- INTRODUCTORY ALGEBRA - FOR HOMEWORK I HAVE TO DO A NUMBER TRICK BY PICKING A ...
- Algebra - How do I express this in algebraic form? And could you please explain ...
- math for elementry school teacher - Mr. Mathemagician asks you to pick any whole...
- math - What are the divisibility short cuts that help you out? Odd numbers can ...
- math - The initial amount is 1 million. Divide it by 4. Divide the result by 5. ...

More Related Questions