FInding Age of a person

A game to find out a person's age and how many coins they are carrying.

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  Ask someone to double their age (either mentally or on paper) but, obviously, they must not tell you.
  
  
  
  
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  Then to add 5 and multiply by 50.
  
  
  
  
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  Finally, they must add the number of coins they have on them.   If they do not have any, nothing is added.
  
  
  
  
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  They then tell you the final answer.
  
  
  
  
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  Now all you have to do is take away 250.  The first two digits of the answer you are left with are the persons age and the last two the number of coins in their possession.
  
  
  

This works unless they are carrying over 100 loose coins.

Example -   25 x 2 = 50 + 5 = 55 x 50 = 2750 + 6 = 2756

                     2756 - 250 = 2506