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 one:	A) 1	B) 9	C) 4	D) 6	E) 3
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?