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)