Question

A marble tile measures 25 cm by 20 cm.
How many tiles will be required to a cover a wall of size 4 m by 3 m​

Answer 1

Answer:

240 tiles required for wall

Step-by-step explanation:

According to the information provided in the question it is given as

Size of marble tiles

Length= l = 25 cm

Breadth =b = 20 cm

Wall size

Length =L =4 m

Breadth =b =3 m

We need to find the number of tiles required for wall

Here we first find the Area of tiles (area of rectangle)

First converting the cm into meter because wall size is in m

1 cm =0.01 m

l=25 cm = 0.01 x 25 =0.25 m

b=20 cm =0.01 x 20 = 0.2 m

Now area of tiles = l x b

$A = 0.25\times 0.2\\A =0.05m^{2}$

Now finding the area of wall ( Area of rectangle)

Area of wall = l x b

$A= 4 \times 3\\A= 12m^{2}$

So tiles required = Area of wall /Area of tiles

putting the values we get the answer

$T =\frac{12}{0.05} \\T = 240 tiles$

Hence 240 tiles required to cover  wall

               

Answer 2

Step-by-step explanation:

1m= 100 cm

So, 4m = 4×100

= 400 cm

and, 3m= 3×100

= 300cm

Area of wall = L×B

= 400×300

= 1,20,000cm^2

Area of marble tile= l×b

= 25 ×20

= 500 cm^2

Number of tiles required to cover the wall

= Area of wall / Area of tile

=120000/500

=240 tiles

Therefore, 240 tiles are needed to cover a wall of 4m by 3m ans