Question

Tristan is laying 12" x 18" tiles on the lab floor. If the lab measures 15 feet by 18 feet, how many tiles does Tristan need, assuning there's no waste.

Answers

Reiny
The lab would measure
180 inches by 216 inches

case 1: longer side of tile along longer side of floor
216/18 = 12
180/12 =15
number of tiles = 12x15 = 180

case 2: shorter side of tile along the longer side of floor
216/12 = 18
180/18 = 10
number of tiles = 10x18 = 180

Of course we had to get the same answer, since division was exact either way, thus no waste

other way:
area of 1 tile = 12" by 18"
= 1ft by 1.5 ft
= 1.5 ft^2
area of floor = 15(18) or 270 ft^2

number of tiles = 270/1.5 = 180

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