If three cubes whose edges measure 3 cm, 4 cm and 5 cm are melted

If three cubes whose edges measure 3 cm, 4 cm and 5 cm are melted and made into a cube, then the edge of the new cube (in cms) is …….
(a) 9
(b) 8
(c) 7
(d) 6

Anurag Mishra Professor Asked on 25th May 2016 in Maths.
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2 Answer(s)

Answer: (d) 6 cm 

Anurag Mishra Professor Answered on 5th July 2016.
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Total volume of 3 cubes = (33 + 43 + 53 ) cm3

= (27 + 64 + 125)cm3

= 216 cm3

Now volume of new cube = 216 cm3

So edge of new cube = cube root of 216 cm3

= 6 cm

keerthana Default Answered on 12th December 2016.
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