# Aptitude - Volume and Surface Area - Discussion

Discussion Forum : Volume and Surface Area - General Questions (Q.No. 15)

15.

How many bricks, each measuring 25 cm x 11.25 cm x 6 cm, will be needed to build a wall of 8 m x 6 m x 22.5 cm?

Answer: Option

Explanation:

Number of bricks = | Volume of the wall | = | 800 x 600 x 22.5 | = 6400. | ||

Volume of 1 brick | 25 x 11.25 x 6 |

Discussion:

11 comments Page 1 of 2.
Sharath said:
1 decade ago

Please tell me, how to calculate the volume of the hollow cuboid.

STEPHEN said:
1 decade ago

How can we divide it simply as both wall and brick is given with different calibrations.

(1)

Faraz hasan said:
1 decade ago

No.of bricks = volume of wall / bricks volume.

First we convert meter into cm.

1mtr = 100cm.

i.e 8*100= 800cm.

6*100= 600cm.

22.5 is already in cm.

Now apply value according to formula,

800*600*22.5 / 25 *11.25*6 = 6400.

First we convert meter into cm.

1mtr = 100cm.

i.e 8*100= 800cm.

6*100= 600cm.

22.5 is already in cm.

Now apply value according to formula,

800*600*22.5 / 25 *11.25*6 = 6400.

Ramesh said:
8 years ago

Then why this formula is not given in the list.

Ranjitha S said:
8 years ago

That's I have the answer 64 only how 6400 comes? Friends, please explain I have used 10 and 100 for avoiding decimal division, But the answer was 64 only. Please help me.

Hrushi said:
7 years ago

First, we calculate the volume of brick.

Then, we calculate volume of wall.

Then we think.

How many bricks are required to constract the given volume of wall?

So,

1volume of brick * X = volume of the wall.

(Here X =number of bricks).

Then X = volume of wall/volume of brick.

Then, we calculate volume of wall.

Then we think.

How many bricks are required to constract the given volume of wall?

So,

1volume of brick * X = volume of the wall.

(Here X =number of bricks).

Then X = volume of wall/volume of brick.

Srj said:
7 years ago

Why volume?

D Priya said:
7 years ago

Hi @Srj,

Both the wall and brick are in cuboid shape. So we consider the total volume of wall to fill with the total volume of bricks. No doubt shud arise to use TSA of cuboid because TSA talks only about the area. But we fill the wall with bricks so we calculated using volume.

Both the wall and brick are in cuboid shape. So we consider the total volume of wall to fill with the total volume of bricks. No doubt shud arise to use TSA of cuboid because TSA talks only about the area. But we fill the wall with bricks so we calculated using volume.

Tharanikaran said:
5 years ago

This is correct. But, Please consider the cement motor.

Raju said:
5 years ago

A solid rectangular block of dimensions 6.6m 3.25m 1.25m is recast into a hollow cylindrical pipe of internal diameter 60cm and thickness 5cm the length of the pipe in meters is?

(1)

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