What is the total number of square tiles required to completely cover the surface area of a cuboid measuring 60 cm × 40 cm × 30 cm, each of which has a side length of 10 cm?
Show answer & explanation
Correct answer: B
Explanation
Length = 60 cm, Width = 40 cm, Height = 30 cm, Side of the tile = 10 cm
According to the formula: Surface Area = 2(lb + bh + hl)
Surface area of the cuboid = 2(60×40 + 40×30 + 30×60)
= 2(2400 + 1200 + 1800)
= 2 × 5400 = 10800 cm²
Tile area = Side²
Area of one tile = 10 × 10 = 100 cm²
Number of tiles = 10800 / 100 = 108