Task: Question Answering
Input (English): Problem: bill is golfing with 3 friends and can either buy generic golf tees that are packaged by the dozen or the higher quality aero flight tees that come by the pair . what is the minimum number of packages of aero flight tees bill must purchase to ensure that he has at least 20 golf tees for each member of his foursome , if he will buy no more than 2 packages of the generic golf tees ? 
Options: a ) 16 , b ) 10 , c ) 28 , d ) 4 , e ) 2
Output (English): c