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How many bricks each of size 10cm by 7.5...

How many bricks each of size 10cm by 7.5 cm by 2.5 cm is required to build a wall 300 cm long 200 cm high and 25 cm thick

Text Solution

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volume of bricks=`10 xx 2.5 xx 7.5 = 187.5 cm^3`
total volume= `300 xx 200 xx 25 = 1500000 cm^3`
`n xx 187.5 = 1500000`
`n xx 1875/10 = 1500000`
`n xx 1875 = 15000000`
`n = 15000000/1875`
`n=8000`
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