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November 24, 2014

November 24, 2014

Posted by **francis** on Sunday, January 27, 2013 at 10:18pm.

- math -
**Reiny**, Sunday, January 27, 2013 at 10:57pmTo have a middle rung, the number of rungs must be odd

e.g. if she is on rung #7, there would be 13 rungs

6 below her, and 6 above her, she is on #7

So assume she is on rung #x

so there are 2x-1 rungs

x+3 - 5 + 7 = 2x-1

-x = -6

x = 6

The ladder had 2(6) -1 or 11 rungs

check:

she started at 6,

went up 3 , was on 9

went down 5, was on 4

went up 7, was on 11, the top rung

(Very dangerous to stand on the top rung of a ladder.)

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