ANSWERS: 4
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As many times as you like... if you want to stop at zero, then 10 times.
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If you mean the roman numeral 21, XXI, only once... then you're left with one numeral. :)
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Once.. then it becomes 19 and so on.
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As many times as you want, watch: 21 - 2 = 19 21 - 2 = 19 21 - 2 = 19 21 - 2 = 19 21 - 2 = 19 21 - 2 = 19 21 - 2 = 19 21 - 2 = 19 21 - 2 = 19 21 - 2 = 19 etc.
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