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 2 of 8.
Subash chander said:
5 years ago
Roof + ceiling area = 4 side walls.
W.k.t area of rectangle l x b.
(12 x 15) + (12 x 15)= 12h + 15h + 12h + 15h.
2(12 x 15) = 2(12h + 15h).
2(12 x 15) = 2h(12+15).
2(12 x 15)
----------------- = h
2 x 27
Volume = LBH.
L=15 b=12 and h is 54.
Then, Volume= 1200.
W.k.t area of rectangle l x b.
(12 x 15) + (12 x 15)= 12h + 15h + 12h + 15h.
2(12 x 15) = 2(12h + 15h).
2(12 x 15) = 2h(12+15).
2(12 x 15)
----------------- = h
2 x 27
Volume = LBH.
L=15 b=12 and h is 54.
Then, Volume= 1200.
(8)
Kishore said:
5 years ago
@Shahid.
You gave a useful stuff, thanks.
You gave a useful stuff, thanks.
Sagar mallik said:
6 years ago
Thanks all for the explanation.
Loki said:
6 years ago
Thanks all for explaining.
Dashi said:
6 years ago
Please anyone explain me to understand this problem.
Revanth said:
7 years ago
Thanks for the answer @Jay R.
AARUSH said:
7 years ago
Thanks @Sonu.
Jay-r said:
7 years ago
Simple formula,
h= (l * b) / (l + b) thus,
h= (15 x 12) / (15 + 12)
h= (180) / (27),
h= 180/27.
Volume of rectangle = l * b * h
= 15 x 12 x 180/27,
= 1200 cubic meter.
h= (l * b) / (l + b) thus,
h= (15 x 12) / (15 + 12)
h= (180) / (27),
h= 180/27.
Volume of rectangle = l * b * h
= 15 x 12 x 180/27,
= 1200 cubic meter.
(1)
Jagruti said:
7 years ago
Thanks. @Sonu.
Manoj said:
7 years ago
Floor Area = 15 x 12 = 180 m.
Ceiling Area = 15 x 12 = 180 m.
Sum of Floor & Ceiling Area = 180 + 180 m = 360 m
- now,in the question "f the sum of the areas of the floor and the ceiling is equal to the sum of the areas of four walls." it means ,
360+360 = 720.
Please, help me to get it.
Ceiling Area = 15 x 12 = 180 m.
Sum of Floor & Ceiling Area = 180 + 180 m = 360 m
- now,in the question "f the sum of the areas of the floor and the ceiling is equal to the sum of the areas of four walls." it means ,
360+360 = 720.
Please, help me to get it.
(2)
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