Anjani wrote:

So does that mean after the ladder pulled away from the wall slop remains as 20?

The 20 doesn't represent the slope of the ladder; it represents the length of the ladder.

The ladder is 20 feet long.

When the base of the ladder is 10 feet from the wall, the top of the ladder is a certain height.

When we move the base of the ladder so that it is now 12 feet from the wall, the top of the ladder drops x feet.

The question wants you to find the value of x

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