Aptitude - Volume and Surface Area - Discussion
Discussion Forum : Volume and Surface Area - General Questions (Q.No. 12)
12.
A cistern of capacity 8000 litres measures externally 3.3 m by 2.6 m by 1.1 m and its walls are 5 cm thick. The thickness of the bottom is:
Answer: Option
Explanation:
Let the thickness of the bottom be x cm.
Then, [(330 - 10) x (260 - 10) x (110 - x)] = 8000 x 1000
320 x 250 x (110 - x) = 8000 x 1000
| (110 - x) = |
8000 x 1000 | = 100 |
| 320 x 250 |
x = 10 cm = 1 dm.
Discussion:
49 comments Page 2 of 5.
Mahek said:
6 years ago
@Rehan.
They have given thickness of walls only not the bottom, so the thickness of the bottom may or may not be equal to the wall.
They have given thickness of walls only not the bottom, so the thickness of the bottom may or may not be equal to the wall.
Sekar agri said:
1 decade ago
@Sarwash.
Thicknes of wall in length and breath, available both side. But in height, only bottom side thickness available.
Thicknes of wall in length and breath, available both side. But in height, only bottom side thickness available.
Sharma said:
1 decade ago
It's clearly given that thickness of the wall is 5cm.
Bottom part is not a wall, it is unknown, So consider X.
Thank You !
Bottom part is not a wall, it is unknown, So consider X.
Thank You !
Sahi said:
1 decade ago
Volume is given in litres so we convert it into cubic cm by multiplying
it by 1000(because 1 liter = 1000 cubic cm).
it by 1000(because 1 liter = 1000 cubic cm).
Efaz said:
1 decade ago
Everything is clear expect that. Why didn't we substract 5cm from 110 cm (the height) , instead we took it as X?
Suriya said:
1 decade ago
Hello sir if you want to find thickness of bottom. Why subtract 10 from the height instead of breath?
Saru said:
7 years ago
I am not clear with subtracting 10 cm instead of 5 cm. Can anyone help me to getting this?
(2)
Rahul said:
4 years ago
How we get 10 multiples of each breadth depth and length? Please explain.
Deepak said:
1 decade ago
Why length and breadth?
Why not just breadth and considering its radius?
Why not just breadth and considering its radius?
Preetha said:
1 decade ago
Still I didn't get that for what we are multiplying by 1000 with 8000?
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