the dimension of bricks are 24 cm xx 12 8 cm..., Area & Volume, General Mathematics

Question:The dimension of bricks are `24 cm xx 12 cm xx 8 cm`. How many bricks will be required to build a wall `24` m long, `8` m high and `60` cm thick, if `10%` of the wall is filled with mortar ?

A `40000` 
B `20000` 
C `50000` 
D `45000`

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+ AnswerD

+ ExplanationVolume of wall 

`= (2400 xx 800 xx 60) cu. cm`.

Volume of wall (apart from mortar)

`= (/100 xx 2400 xx 800 xx 60) cu.m`.

Volume of `1` bricks `= (24 xx 12 xx 8) cu. cm.`

:. Number of bricks required

`= (90/10 xx 2400 xx 800 xx 60 xx 1/(24 xx 12 xx 8)`

`= 45000`.

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