Question

A marble tile measures 10 cm × 12 cm. How many tiles will be required to cover a wall of size 3 m × 4 m? Also, find the total cost of the tiles at the rate of Rs 2 per tile.

Answer 1

We have,
Area of the wall = 3 m x 4 m = 12 m²
Area of one marble tile = 10 cm x 12 cm = 120 cm² = 0.012 m² [ Since 1 m² = 10000 cm² ]
Thus,
Number of tiles = $\frac{\mathrm{Area}\mathrm{of}\mathrm{wall}}{\mathrm{Area}\mathrm{of}\mathrm{one}\mathrm{tile}}=\frac{12{\mathrm{m}}^2}{0.012{\mathrm{m}}^2}=1000$
Cost of one tile = Rs. 2
Total cost = Number of tiles x Cost of one tile
= Rs. (1000 x 2) = Rs. 2000