If three cubes of metal whose edges are 9 cm, 12 cm and 15 cm made into a single cube, then edge of the new cube so formed is :
A. 15 cm
B. 16 cm
C. 18 cm
D. 21 cm
Answer:C
If three cubes of metal whose edges are 9 cm, 12 cm and 15 cm made into a single cube, then edge of the new cube so formed is :
A. 15 cm B. 16 cm C. 18 cm D. 21 cm