The jump from 2 cm to 6 cm is "times 3". This is the linear scale factor.
We cube the linear scale factor value to get the volume scale factor.
The volume scale factor is 3^3 = 27, meaning that the larger egg's volume is 27 times greater compared to the smaller egg's volume
larger volume = 27*(smaller volume)
Assuming the two eggs have the same density, this would mean that the larger mass is 27 times that of the smaller mass
larger mass = 27*(smaller mass)
larger mass = 27*(4 grams)
larger mass = 108 grams
