Three cubes of edges 20 cms, 12 cms and 16 cms are meted without loss of metal into a single cube. The edge of the new cube will be:
A)18 cms B)24 cms C)16 cms D)20 cms

• Ans: 24
  (20)^3 + (12)^3 + (16)^3 = 13824
  Which is cube of 24.
• 4 years agoHelpfull: Yes(1) No(1)
• (20)^3 + (12)^3 + (16)^3 = 13824
  (13824)^1/3 = 24
  Ans. 24
• 4 years agoHelpfull: Yes(1) No(0)
• ans:24
  13824^1/3=?
  so find unit digit from options whose cube results in 4 at its unit place.
  only 24 as cube of 4 is 64.
• 3 years agoHelpfull: Yes(0) No(0)