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A ladder 25 m long is leaning against a ...

A ladder 25 m long is leaning against a wall which is perpendicular to the level ground. The bottom of the ladder is 7 m from the base of the wall. If the top of the ladder slips down 4 m, how much will the bottom of the ladder slip?

A

A.7 m

B

B.8 m

C

C.10 m

D

D.15 m

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