Question

3. A swimming pool is 30 m long, 10 m wide and 2.5 m deep. Its walls have been covered with
tiles of size 20 cm x 10 cm. Find the number of tiles to be used on its floor and four walls.
The sides of a cuboid are in the ratio. 6:4:3. Surface area of its faces is 432 sq. m. Find its sides.​

Answer 1

$\huge\bold\red{HOLA}$

Given ;

l = 30 m

b = 10 m

h = 2.5 m

Area of 4 walls and floor

= 2(l+b)h + lb

= 2(30+10)2.5 + (30×10)

= 200+300

= 500 m sq.

Area of 1 tile

= 20cm × 10cm

= 0.2 m × 0.1 m

= 0.02 m sq.

Number of tiles required

= Total Area/area of one tile

= 500/0.02

= 25000 Tiles

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4.7

Answer 2

Step-by-step explanation:

Area of 4 walls and floor

= 2(l+b)h + lb

= 2(30+10)2.5 + (30×10)

= 200+300

= 500 m sq.

Area of 1 tile

= 20cm × 10cm

= 0.2 m × 0.1 m

= 0.02 m sq.

Number of tiles required

= Total Area/area of one tile

= 500/0.02

= 25000 Tiles