A rectangular tank has a length of 1 meter, a width of 80 cm, and a height of 50 cm. If the tank needs to be covered completely with square tiles of side 20 cm, how many tiles will be required?
Show answer & explanation
Correct answer: B
Explanation
Length = 1 m = 100 cm
Width = 80 cm
Height = 50 cm
Side of the tile = 20 cm
Total Surface Area = 2(lb + bh + hl)
= 2(100×80 + 80×50 + 50×100)
= 2(8000 + 4000 + 5000)
= 2 × 17000 = 34000 cm²
Area of one tile = 20 × 20 = 400 cm²
Number of tiles = 34000 ÷ 400 = 85 tiles