The edges of three metal cubes are 1 cm, 2 cm, and 4 cm respectively. A new cube is made by melting these three cubes together. What is the edge of the new cube (in centimeters)? Choose the correct choice from the following answers:
A) 3.8	B) 4.2	C) 4.6	D) 5.0	E) 5.4
The total volume is 1^3+2^3+4^3=73   The edge of the new cube is the cube root of 73 which is about 4.2 cm.   The answer is 4.2.
<result>B</result>
The edges of three metal cubes are 1 cm, 2 cm, and 4 cm respectively. A new cube is made by melting these three cubes together. What is the edge of the new cube (in centimeters)?