The height of the wall is 6 times its width and lenght of the wall is 7 times its height .if the volume of the wall be 16128 cu.m.its width is  Choose the correct choice from the following.
A) 4 m	B) 5 m	C) 6 m	D) 7 m	E) 8 m

Rationale: explanation : let width = x then , height = 6 x and length = 42 x 42 x × 6 x × x = 16128 x = 4 answer : a
Answer: A