Aptitude - Volume and Surface Area - Discussion
Discussion Forum : Volume and Surface Area - General Questions (Q.No. 14)
14.
A large cube is formed from the material obtained by melting three smaller cubes of 3, 4 and 5 cm side. What is the ratio of the total surface areas of the smaller cubes and the large cube?
Answer: Option
Explanation:
Volume of the large cube = (33 + 43 + 53) = 216 cm3.
Let the edge of the large cube be a.
So, a3 = 216 
a = 6 cm.
 Required ratio = |
 |
6 x (32 + 42 + 52) |  |
= | 50 | = 25 : 18. |
| 6 x 62 | 36 |
Discussion:
24 comments Page 3 of 3.
Arya said:
1 decade ago
Why we need that 3^2+4^2+5^2?
Imran said:
1 decade ago
How required ratio come?
Hrushi said:
8 years ago
Nice explanation @Hary.
(1)
Sonsm said:
4 years ago
Good, Thanks @Tarifa.
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