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The Problem

Lily was in the middle rung of a ladder. She went up 3 rungs, then down 5 rungs and then up 7 rungs where she rested.

Later she climbed up the remaining 7 rungs on the ladder. How many rungs did the ladder have?

Answer provided by our tutors

She was in the middle.

Then she went 3 up, 5 down,then 7up.

So finally she is at,

3-5+7 = 5  rungs above the middle one.

Then she climbs up 7 rungs on the ladder.

So total rungs after the middle rung = 5+7 =12.

So total no of rungs = 12+12+1 =25

 

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