Question
Find the number of bricks , each measuring 24 cm x 12 cm x 8 cm , required o construct a wall 24 m long , 8 m high and 60 cm thick , if 10% of the wall is filled with mortar ?
Answer: Option A
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Volume of the wall = (2400 x 800 x 60 )cu. cm
Volume of bricks = 90 % of the volume of the wall
= `(90/100 xx 2400 xx 800 xx 60)` cu. cm.
Volume of 1 brick = ( 24 x 12 x 8) cu.cm.
`:.` Number of bricks = `(90/100 xx (2400 xx 800 xx 60)/(24 xx 12 xx 8))` = 45000.
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