three cubes of metal whose edges are 9 , 12 and 18 cm respectively , are melted and one new cube is made . find the edge of the new cube ?
"93 + 123 + 183 = a 3 = > a = 20.2 answer : a"
power(add(add(volume_cube(9), volume_cube(12)), volume_cube(18)), const_0_33)