The edge of three cubes of metal is 3 dm, 4 dm and 5 dm. They are melted and formed into a single cube. Find the edge of the new cube?  Choose the most appropriate option.
A) 2
B) 8
C) 7
D) 6
E) 9
33 + 43 + 53 = a3 =&gt; a = 6   Answer:6
<result>D</result>
The edge of three cubes of metal is 3 dm, 4 dm and 5 dm. They are melted and formed into a single cube. Find the edge of the new cube?