Chemistry calculations

This question is about the extraction of metals.
Element R is extracted from its oxide by reduction with hydrogen.
The equation for the reaction is:
3H2 + RO3 R + 3H20
03
1
The sum of the relative formula masses (M) of the reactants (3H2 + RO3) is 150
Calculate the relative atomic mass (A) of R.
Relative atomic masses (A): H = 1 O= 16
I
I
[2 marks]
Relative atomic mass (A) of R =