PUHOLINO: just don't ever question my math skills, they're just fine ;-)
"P", I have too question your math skills for "MY" scenario. :)
Get out of the "box"! :) using a putter "backwards" and redo your math! ")
Now lets see how good your math skills really are?
Two days ago, I made a bet, won the bet, doubled my "bet", "gave" $10 bucks to a good friend and went home.
Yesterday, I made the same bet, won the bet, doubled my "money" gave $10 to a homeless person and went home!
Today, I made a bet, won my bet, doubled my money, lost a $10 bill on my way home!
What did I start with?