Task: Question Answering
Input (English): Problem: the average salary of all the workers in a workshop is $ 1000 . the average salary of 5 technicians is $ 5000 and the average salary of the rest is $ 500 . the total number of workers in the shop is ? 
Options: a ) 25 , b ) 20 , c ) 15 , d ) 30 , e ) 18
Output (English): a