the volume of a wall 5 times as high it is broad..., Area & Volume, General Mathematics

Question:The volume of a wall,`5` times as high as it is broad and `8` times as long as it is high, is `12.8` cu. mertres. The breadth of the wall is :

A `30 m` 
B `40 m` 
C `22.5 m` 
D `25 m`

/113

+ AnswerB

+ ExplanationLet, breadth = x mertres. Then,

Heigth` = 5x` mertres and length `= 40 x` mertres.

`:. x xx 5x xx 40x`

`= 12.8`

`or x^3 = 12.8/200`

`= 128/2000`

`= 64/1000.`

`:. x  4/10 m`

`= (4/10 xx 100) cm`

`= 40 cm.`

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