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Old 08-26-2016, 07:48 AM
aceplace57 aceplace57 is offline
Join Date: Oct 2009
Location: CentralArkansas
Posts: 23,188
I was showing my steps in the most compact way possible. To avoid a tedious and long post.

Both problem s are of course party tricks and the math is meant to be done in the person's head.

I can see this trick going horribly wrong. You're 39! No I'm not! Then it becomes obvious the mental arithmetic slipped a gear.

But it's still a neat party trick when it works.