self Exam Logical Reasoning General Mental Ability

The height of a wall is six times its width and the length of a wall is seven times its height. If volume of the wall be 16125 Cu. m., its width is

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let width be w , then height =6*w and length = 7(6*w).
Therefore,Volume=>l*w*h=(7*6*w)*w*(6*w)=42*6*w^3
=>Vol=16125=252*w^3
=>w=4 m approx
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