Discussion

Explanation:

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Let the base is drawn by x unit.

∴ Height of top of the ladder will decrease by x2.

∴ By Pythagoras theorem,

24-x22 + (7+x)2 = 625

x24 + x2 - 24x + 14x = 0

5x24 = 10x

∴ x = 8

Hence, option (e).

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