Task: Question Answering
Input (English): Problem: solution x is 10 percent alcohol by volume , and solution y is 30 percent alcohol by volume . how many milliliters of solution y must be added to 200 milliliters of solution x to create a solution that is 20 percent alcohol by volume ? 
Options: a ) 200 , b ) 300 , c ) 400 , d ) 500 , e ) 600
Output (English): a