It is a question that leads us to know the proportion of one element to another. We have initially that the mass of the earth is of
m_E = 5.98*10^{24}kg
While the mass of the Moon is of
m_M = 7.35*10^{22}kg
The ratio between the two is given by the function
This means that the mass of the earth is 81.36 times larger than that of the Moon.