Answer: Total volume of ice that he can make 125+27=152 cubic. units.
Explanation:
Since we have given that
Side length of first cube = 3 units
Side length of second cube = 5 units
He having two cubes that he filled with water to make ice cubes.
Volume of first cube is given by

volume of second cube is given by

Hence, total volume of ice that he can make
=125+27=152 cubic. units.