The edges of three metal cubes are 4 cm, 5 cm, and 6 cm respectively. A new cube is made by melting these three cubes together. What is the edge of the new cube (in centimeters)?
Select the correct option:
A) 6.6 B) 6.8 C) 7.0 D) 7.2 E) 7.4
The total volume is 4^3+5^3+6^3=405   The edge of the new cube is the cube root of 405 which is about 7.4 cm.   The answer is 7.4.
<result>E</result>
The edges of three metal cubes are 4 cm, 5 cm, and 6 cm respectively. A new cube is made by melting these three cubes together. What is the edge of the new cube (in centimeters)?