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 5 of 5.
Suriya said:
1 decade ago
Hello sir if you want to find thickness of bottom. Why subtract 10 from the height instead of breath?
Mahesh said:
1 decade ago
Why we are subtracting 10? Please tell any one.
Mani said:
1 decade ago
I can't understand please tell me brief.
Sarwesh Alshi said:
1 decade ago
Why not 2x? They wrote here only as x.
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.
Sikandar said:
1 decade ago
How from the question it is clear that whether it is open at top or not because in solution it is consider only bottom thickness while subtraction.
Mayawati Chotala said:
10 years ago
Still can't understand why 10? Which both sides are you talking about?
Pramod Kajla said:
9 years ago
@All.
For the better understanding of this question, you have to visualize in 3D (like a cuboid with walls and open at top), then only you will be able to understand the actual concept of question.
Because for inner length and breadth, the thickness will be used from two sides (considerr it as left and right), but for height it will be calculated from one side (consider it as bottom side only), because the cuboidal tank is open from upside (as there will be the four sides of wall and one will be bottom).
For the better understanding of this question, you have to visualize in 3D (like a cuboid with walls and open at top), then only you will be able to understand the actual concept of question.
Because for inner length and breadth, the thickness will be used from two sides (considerr it as left and right), but for height it will be calculated from one side (consider it as bottom side only), because the cuboidal tank is open from upside (as there will be the four sides of wall and one will be bottom).
Ramesh said:
9 years ago
Nothing I understand, please anyone explain in easy way.
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