Rubiks Cube with the Ping Pong Ball!
Babu was crazy for his Rubiks cube and Ping pong ball. His mother was fed up with her son's Cube and the ball and one morning she threw his cube into water. Babu woke up and saw the cube was floating in water with 2cm of it above the water level. His mother then placed the ping pong ball of 100g on the surface of the cube and the cube went down from the surface of the water by 1cm. Then she challenged Babu that if he could determine the mass of the cube, she would give both the cube and the ball back to him. Otherwise he was not allowed to touch them again.
So, if u also love Rubiks Cube, help Babu to find out the mass of the cube so that he can get that back! Come on! Try! What's the mass of the Rubiks cube?