Rotational Motion Part 2

Two identical spheres each of mass 2‌kg and radius 50‌cm are fixed at the ends of a light rod so that the separation between the centers is 150‌cm. Then, moment of inertia of the system about an axis perpendicular to the rod and passing through its middle point is ‌

x

20

‌kg‌m2, where the value of x is___