Predict-I predict this question will be about problem solving and trying all possibilities!

Read- The question said- I think of a number then double it then add four if the answer is twenty what was original number?

Strategy- Work backwards. Working backwards will help me answer and understand the question.

Solve- By taking away four from twenty that equaled sixteen. That was when I realised I should do eight because then you double eight and that equals sixteen. Then I added four on to sixteen because I knew that from taking away four from twenty.

Answer- Must be eight!