CAT Quantitative Ability Questions | CAT Geometry questions

CAT/1995

Question . 107

The length of a ladder is exactly equal to the height of the wall it is resting against. If lower end of the ladder is kept on a stool of height 3 m and the stool is kept 9 m away from the wall the upper end of the ladder coincides with the tip of the wall. Then, the height of the wall is

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Method of solving this CAT Quantitative Ability Question from Geometry question