SOLUTION: start with 19, take away 1, leave 20. how do you do that?

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Question 14279: start with 19, take away 1, leave 20. how do you do that?
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Try Roman numerals:
19 = XIX Take away the I in the middle and you get XX = 20