Task: Question Answering
Input (English): Problem: an astronomer noted that a grouping of red giant stars had an average solar mass of 8 m each , and a grouping of white dwarf stars had an average solar mass of 1.5 m each . if the astronomer calculated the total solar mass of both groupings to be 49 m , what total number of red giant stars and white dwarf stars did the astronomer note ? 
Options: a ) 10 , b ) 11 , c ) 12 , d ) 13 , e ) 14
Output (English): b