An aquifer receives 40 m3 of precipitation and loses 10 m3 of water through natural movement. How much water can be pumped from the aquifer to balance the budget?

the answer is 0.42 is that is an option. this question provides no info

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.  

so whats the answer tell me