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Find the number of bricks, each measu...

Find the number of bricks, each measuring `25 c m\ x\ 12. 5 c m\ x\ 7. 5 c m` required to construct a wall `6\ m\ ` long, `5\ m` high and `0. 5\ m` thick, while the cement and sand mixture occupies `1/(20)` of the volume of the wall.

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