Question

Number of marble slabs of size 20cm×20cm required to pave the floor of a square room of side 3metres is?

Answer 1

area of the marble slab

the side given of the marble slab

$= 20cm$

$= \frac{20}{100} = 0.2m$

$area = (side) {}^{2}$

$area = (0.2m) {}^{2}$

$= 0.04m {}^{2} ......(1)$

area of the square room

$= ( 3m) {}^{2}$

$= 9m {}^{2} .......(2)$

dividing 2by1

we get

Number of marble slabs required to pave the floor of the square room is

$no \: of \: marbles = \frac{9m {}^{2} }{0.04m {}^{2} }$

$number \:of \: marbles = 225$

.........

$\large{vergilmustDie}$

Answer 2

Area of marble slabs = Length × Breadth

= 20 × 30

= 600 cm²

Side of square room = 3m = 300cm

Area of square room = side × side

= 300cm × 300cm

= 90000cm²

$no. \: of \: marbles \: slabs \: = \frac{area \: of \: room }{area \: of \: marble \: slabs } \\ = \frac{90000}{600} = 150$