Question

Q.5 The length of the library is 30 meters, the width is 18 meters and the height is 12 meters, how many tiles of the size of 25cm x 25cm will be placed on the ceiling of the library?
1 point
8,600
8,640
8,680
9,000​

Answer 1

Answer:

The answer to this question is 8640 centimeters

Step-by-step explanation:

Given the length of the libary is 30 meter

We know 1 meter = 100 centimeters

Now 30 meter =3000 centimeters

The width of the libary is 18 meter

Now 18 meter = 1800 centimeters

And height 12 m = 1200 cm

The ceiling of the cuboid is a rectangle

We know the area of the rectangle is = length × width

Here legth=3000 cm and width =1800 cm

Now the area =3000×1800=5400000 square cm

Area of tiles =25×25=625 square cm

We have to find the number of tiles to cover the ceiling of libary

The number of tiles need to cover is (5400000÷625)=8640 tiles

Answer 2

Question:-

The length of the library is 30m, the width is 18m and the height is 12m. How many tile of the size of 25cm×25cm will be placed on the ceiling of the library ?

Solution :-

First we have to convert m to cm :-

Here, 1m = 100cm

• 30m = 30×100 = 3000cm
• 18m = 18×100 = 1800cm
• 12m = 12×100 = 1200cm

Therefore,

Length = 3000cm

Breadth = 1800cm

So, Area of the ceiling = rectangle

»» l × b

=> 3000 × 1800

=> 5,400,000

Therefore, area of the ceiling is 5,400,000cm².

Then,

Area of tile = Side × Side

=> 25 × 25

=> 625

Therefore, area of tile is 625cm².

Hence, Number of tile required to on the ceiling of the library = area of ceiling/area of tile

=> 5,400,000/625

=> 8,640

So, 8640 tiles will required.