Alright, let's solve the problem step-by-step.
1. Determine the dimensions of the room:
- The room is 15 feet long and 17 feet wide.
2. Calculate the area of the room:
- Area = Length × Width
- Area = 15 feet × 17 feet
- Area = 255 square feet
3. Determine the area of each tile:
- Given that each tile has an area of 3 square feet.
4. Calculate the number of tiles needed:
- Number of tiles = Area of the room / Area of one tile
- Number of tiles = 255 square feet / 3 square feet per tile
- Number of tiles = 85 tiles
So, Mia should buy 85 tiles. The correct answer is:
B. 85