Answer: 2800 Tiles
Step-by-step explanation: area of the room = l × b
 = 350 × 200 = 70,000
 Area covered by one tile = 5 × 5 = 25
 No. of tiles required to cover entire room = 70,000/25
 = 2,800
 total 2,800 tiles would be needed to tile the complete room.