I think of a number…

1). I think of a number and add 7. The answer is 15. What number did I think of?

2). I think of a number and subtract 12. I get the answer 42. What number did I think of?

3). I think of a number and multiply it by 3 and get the answer 27. What number did I think of?

4). I think of a number and divide it by 6. I get the answer 7. What number did I think of?

5). I think of a number and multiply it by 2 and then add 3. I get the answer 11. What number did I think of?

6). I think of a number and divide it by 5 then add 4. I get the answer 13. What number did I think of?

Answers: For each question work from the answer and do the inverse operation (the opposite function) of each step starting with the last step.

1). 8 (Work in reverse 15 – 7 = 8)

2). 54 (42 + 12 = 54)

3). 9 (27 divided by 3 = 9)

4). 42 (6 x 7 = 42)

5). 4 ( 11 – 3 = 8 then divide 8 by 2 to get 4)

6). 45 (13 – 4 = 9 then 9 x 5 = 45)