three cubes of metal whose edges are 5 , 12 and 15 cm respectively , are melted and one new cube is made . find the edge of the new cube ?
"53 + 123 + 153 = a 3 = > a = 17.3 answer : c"
power(add(add(volume_cube(5), volume_cube(12)), volume_cube(15)), const_0_33)