Task: Question Answering
Input (English): Problem: in a school 50 % of the students are younger than 10 , 1 / 20 are 10 years old and 1 / 10 are older than 10 but younger than 12 , the remaining 70 students are 12 years or older . how many students are 10 years old ? 
Options: a ) 50 , b ) 60 , c ) 10 , d ) 20 , e ) 30
Output (English): c