Question

Erin is buying floor tile to put in a room that is 10 ft. by 15 ft. She has chosen tiles that are 18 in by 18 in. Assuming that she needs to buy 10% extra to be safe, how many tiles will she need to buy?

Answer 1

18 inches first of all is 1.5 feet, since 12 inches is 1 feet,and 6 inches is 0.5 feet

so lets see what area we need. 10 ft by 15 ft = 150 ft^2
now out tile area is 1.5ft by 1.5 ft = 2.25 ft^2
150/2.25 =200/3=66+2/3, we need atleast 66 and 2/3rd of a tile, we must by atleast 10% to be extra safe so
10% of 66+2/3 is 6.6 + 2/30, so we will by 66+2/3 + 6.6+2/30 =73.3333333333, so we will by a total of 73 tiles.

Answer 2

Erin should buy 74 tiles to be safe.

Since Erin is buying floor tile to put in a room that is 10 ft. by 15 ft., and she has chosen tiles that are 18 in by 18 in., assuming that she needs to buy 10% extra to be safe, to determine how many tiles will she need to buy the following calculation must be performed:

The equality between feet and inches must be established, then the area of the room must be calculated, and then the area of each tile. Then, the area of the room must be divided by the area of the tile to know how many should be used.

• 1 foot = 12 inches  
• 1.1 x ((10 x 12) x (15 x 12)) / (18 x 18) = X
• 1.1 x (120 x 180) / 324 = X
• 1.1 x 21,600 / 324 = X
• 23,760 / 324 = X
• 73.33 = X

Therefore, Erin should buy 74 tiles to be safe.

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