Question

Max wants to tile his entire bedroom. The length and width of his bedroom is 21 units and 18 units, respectively. He wants to tile it with square tiles of side length 3 units. The cost of each tile is $\$5$. What is the total cost of the tiles required to tile the bedroom?

Answer 1

● The length of the bedroom = 21 units
● The width of the bedroom= 18 units
● Area of a rectangle = Length $\times$ Width
● Area of the bedroom = 21 $\times$ 18 sq units


● Area of the bedroom = 378 sq units
● Length of each side of the square tile = 3 units
● Area of a square tile= Side $\times$ Side
● Area of the tile = 3 $\times$ 3 sq units
● Area of the tile = 9 sq units
● The bedroom is completely fitted with square tiles.
● Area of bedroom = Area of tiles $\times$ Number of tiles
● So, 378 = 9 $\times$ Number of tiles
● The division equation for this multiplication equation will be,
Number of tiles = 378 $÷$ 9

● Number of tiles $=42$
● So, number of tiles required $=42$ tiles
● Cost of each tile $=\$5$
● Total cost of tiling = Cost of each tile $\times$ Number of tiles
● Total cost = $\$5\times 42$


● So, the total cost of tiling $=\$210$

Hence, option B is correct.