Question
The number of bricks, each measuring 25 cm x 12.5 cm x 7.5 cm, required to construct a wall 6 m long high and 0.5 m thick , while the mortar occupies 5% of the volume of the wall is :
Answer: Option C
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Volume of the bricks = 95% of volume of wall =` ( 95/100 xx 600 xx 500 xx 50) cm^3`
Volume of brick =` ( 25 xx 12.5 xx 7.5 ) cm^3`
`:.` Number of bricks = `(95/100 xx (600 xx 500 xx 50)/(25 xx 12.5 xx 7.5))` = 6080.
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