Task: Question Answering
Input (English): Problem: how many pounds of salt at 70 cents / lb must be mixed with 45 lbs of salt that costs 40 cents / lb so that a merchant will get 20 % profit by selling the mixture at 48 cents / lb ? 
Options: a ) 5 , b ) 9 , c ) 40 , d ) 50 , e ) 25
Output (English): b