6. 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?
A. 3 : 2
B. 27 : 20
C. 2 : 1
D. 25 : 18
6. 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?
A. 3 : 2
B. 27 : 20
C. 2 : 1
D. 25 : 18