Task: Question Answering
Input (English): Problem: a cement mixture is composed of 3 elements . by weight , 1 / 2 of the mixture is sand , 1 / 5 of the mixture is water , and the remaining 15 pounds of the mixture is gravel . what is the weight of the entire mixture in pounds ? 
Options: a ) 30 , b ) 40 , c ) 50 , d ) 60 , e ) 80
Output (English): c