Find your friend’s age without being told!

You can find out the age of your friend without being told by asking him to play a simple mathematical game and ask him to carry out the following instructions in the given order.

  1. Write down your age
  2. Add 5 to it.
  3. Double the result. 
  4. Add 10 to it.
  5. Multiply theresult by 5.
  6. Subtract 100 from it.

Get the final result from your friend and cross out the last digit to obtain your friend’s age. Try this mathematical game with different people.

I got found this trick in a Mathematics book of Grade 8 :P  

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