Aptitude - Volume and Surface Area - Discussion
Discussion Forum : Volume and Surface Area - General Questions (Q.No. 3)
3.
A hall is 15 m long and 12 m broad. If the sum of the areas of the floor and the ceiling is equal to the sum of the areas of four walls, the volume of the hall is:
Answer: Option
Explanation:
2(15 + 12) x h = 2(15 x 12)
 h = |
180 | m = | 20 | m. |
| 27 | 3 |
 Volume = |
 |
15 x 12 x | 20 |  m3 |
= 1200 m3. |
| 3 |
Video Explanation: https://youtu.be/V8EQ1YIaH74
Discussion:
75 comments Page 8 of 8.
Ann said:
10 years ago
Did not understand any of this at all, sorry.
Anju b s said:
1 decade ago
It is right because it is the curved surface area of cuboid.
Anju bs said:
1 decade ago
Yes it is right because it is the curved surface area of the cuboid.
Sravanthi said:
1 decade ago
@Sonu.
It's lh not lb in your explanation.
i.e Yes the surface area of cuboid is 2 (lb+bh+hl).
But surface area of 4 walls does not includes areas of floor+ceiling.
That's why total area of walls = 2(lb+bh+bl) - 2 (lb) = 2(hb+lh) = 2 (b+l)h.
It's lh not lb in your explanation.
i.e Yes the surface area of cuboid is 2 (lb+bh+hl).
But surface area of 4 walls does not includes areas of floor+ceiling.
That's why total area of walls = 2(lb+bh+bl) - 2 (lb) = 2(hb+lh) = 2 (b+l)h.
Nameera khan said:
1 decade ago
But I did not get the starting explanation.
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