* 15. A room is 12 m by 10 m by 10 m. Find the cost of covering its floor with bricks 20 cm by 6 cm, if the cost of one thousand bricks is 300.
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ok so the area of floor is = area of rectangle
area of rectangle = L × B = 12 × 10
= 120 m^2
area of brick = 20 × 6 = 120 cm^2
convert in metres = 120/100 = 1.2m^2
Bricks Required = 120/1.2 = 100
Price of single brick = 1/300
= 0.003
Cost To Cover Floor = 0.003 × 100
Total cost is 0.3
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