Task: Question Answering
Input (English): Problem: a building contractor employs 20 male , 15 female and 5 child workers . to a male worker he pays rs . 25 per day , to a female worker rs . 20 per day and a child worker rs . 8 per day . the average wage per day paid by the contractor is ? 
Options: a ) 19 , b ) 21 , c ) 23 , d ) 25 , e ) 27
Output (English): b