A solid cube just gets completely immersed in water when
a 0.5 kg mass is placed on it. If the mass is removed, the cube
is 5 cm above the water level. What is the length of each side of the cube?
(Density of water =1 kg/L
A. 8 cm
B. 10 cm
C. 20 cm
D. 6 cm

If possible can you also explain the answer.
Thank you!