Task: Question Answering
Input (English): Problem: a marketing survey of anytown found that the ratio of trucks to sedans to motorcycles was 3 : 7 : 2 , respectively . given that there are 10,500 sedans in anytown , how many motorcycles are there ? 
Options: a ) 1260 , b ) 3000 , c ) 3600 , d ) 4200 , e ) 5200
Output (English): b