Final answer:
To cover a floor that is 205 inches wide with 10-inch wide boards, 20.5 boards would be required. Since you can’t use half a board, you would need to round up to 21 boards.
Step-by-step explanation:
To find out how many 10 4-inch wide boards are needed to cover a floor 205 inches wide, you can use division. Since each board is 10 4 inches wide, which is a simple typo and should be understood as 10 inches, we can divide the total width of the floor by the width of one board:
205 inches (total width) ÷ 10 inches (width of one board) = 20.5
This means you would need 20.5 boards to cover the floor. However, since you cannot have half a board, you would need to round up to the nearest whole number. Therefore, you would actually need 21 boards to cover the entire width of the floor.