Question

# The number of marble slabs of size $$20\ cm \times 30\ cm$$ required to pave the floor of a square room of side $$3m$$ is:

A
100
B
150
C
225
D
25

Solution

## The correct option is B $$150$$Area of marble slab$$= 20 \times 30=600cm^2$$.Area of the floor $$=3m^2$$ We know that: $$1m = 100cm$$Therefore, total no. of marble slabs $$=$$ $$\dfrac{area \ of \ floor}{area\ of\ marble\ tile}$$                                                            $$=\dfrac {9\times 100^2}{600}=150$$ tilesMathematics

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