21- only true legends know
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You can easily solve simple math problems by counting by 2s then add the remainder. You can often do these in your head or counting out loud. For example:You would count by 2s::: 10, 12, 14, 16, 18 PLUS 1 equals 19.
So simply, You add a 3 and another making 6. Then you multiply it by 3 and add a 1 That makes 21! (joke)