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find the number of 15 centimetre square tiles required to cover a rectangular floor
of 5.4m long and 4.05m wide. find the cost of tiling the floor if each tile costs RM 3
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The solution by @mananth gives a correct answer, but the logic of his solution is incorrect.
An accurate solution requires another approach.
First, we determine how many tiles are along the longer side. It is
= 36.
Fortunately, it is an integer number.
Next, we determine how many tiles are along the shorter side. It is
= 27.
Fortunately, it is an integer number, too.
Next step, we determine the total number of tiles as the product
36*27 = 972.
Finally, we determine the cost of tiling 3*972 = 2916 RM. ANSWER
Solved (accurately).
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Without checking that the numbers of tiles along each dimension are integer numbers,
you can not state that the required number of tiles is the product of dimensions (the total area)
divided by the area of a single tile.