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December 21, 2014

December 21, 2014

Posted by **kelvin** on Thursday, December 3, 2009 at 7:50pm.

- math -
**MathMate**, Thursday, December 3, 2009 at 10:41pmIf he stepped on the middle step, there must be an odd number of steps, say 2n+1.

He started off at step n+1.

"he climbed up three steps"

he was on step n+1+3.

"go down five steps"

he was on step n+1+3-5.

"climbed up the last six steps and was at the top"

n+1+3-5+6=2n+1

solve for n, and the number of steps is 2n+1.

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