With the exception of few candidates that quoted wrong formular thus resulting into wrong answer, the question was well attempted by majority of the responding candidates.

The expected answer is:
           
M1   =   M2
Q1          Q2                                                                                                                  

M1       =          0.625 x 10-4
2 x 96500        1.57 X 20 x 60                                                                                               

M1    =    0.064g (or 6.4 x 10-2) kg                                                                                                                 
∴  Relative atomic mass  =  64