Find the number of bricks, each measureing `25 c mxx12. 5c mxx7. 5c m` required to construct a wall `6m` long ,`5m`high and `0.5m` thick , while the cement and sand mixture occupies `1/(20)` of the volume of the wall.

Explanation

Volume of wall`=6xx5xx0.5=15m^3`
Volume of wall occupied by the bricks`=(1-1/20)xx`volume of wall`=(19xx15)/20=14.25 m^3`
Volume of each brick`=25/100xx125/1000xx75/1000`m
Number of bricks required = volume of wall / volume of each brick
`=14.25/(25/100xx125/1000xx75/1000)`
`=6080` bricks