# Math 213 Elementary Math

posted by .

20. Think of a number.
Double the result.
Subtract 8.
Double the result.
Divide by 4.
Subtract 6.
Your answer will be the original number. Explain how this trick works.

• Math 213 Elementary Math -

If 20 is the answer, what is the question?
20 is not a question

## Similar Questions

2. ### elementary

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.
3. ### arithmetic

How does this work “Think of a #. Add 7. Double the result. Subtract 8. Double the result. Add 12. Divide by 4. Subtract 6. Your answer will be the original number.
4. ### Algebra

How do I express this in algebraic form? And could you please explain how you came up with the expression?
5. ### INTRODUCTORY ALGEBRA

FOR HOMEWORK I HAVE TO DO A NUMBER TRICK BY PICKING A NUMBER ADD 5 DOUBLE THE RESULT SUBTRACT 4 THEN DIVIDE THE RESULT BY 2 AND THE RESULT SHOULD BE THREE.THEN I HAVE TO EPLAIN WHY THE RESULT IS ALWAYS 3. I DON'T GET IT CAN YOU PLEASE …
6. ### math for elementry school teacher

Mr. Mathemagician asks you to pick any whole number. Add 10. Multiply the result by 4. Add 200. Divide by 4. Subtract your original number. Mr. Mathemagician says, “You’re final result is 60!” Explain Mr. Mathemagician’s trick?
7. ### Algebra

Hello all! I had a quick homework question: I have to prove that the output of this always ends up as 1, regardless of the starting number: *Think of a number between 1 and 10. Add 1; double the result; add 3; subtract 4; add 5; halve …
8. ### Algebra

Pick a number. Double it. Multiply the result by 3. Add 24. Divide by 6. Subtract your original number. Is the result always the same?
9. ### Math

Repeat the following procedure for the four given numbers. Add 7 . Double the result. Subtract 4 . Divide by 2. Subtract the original selected number. The 1st number is 1 . The result is 5 . The 2nd number is 4 . The result is 5 . …
10. ### math

think of a number. Triple it. Add 100. double the result. Add 100. divide the result by 4. subtract one a half time the original number. What is the result?

More Similar Questions