Task: Question Answering
Input (English): Problem: in a fort , there are 1200 soldiers . if each soldier consumes 3 kg per day , the provisions available in the fort will last for 30 days . if some more soldiers join , the provisions available will last for 25 days given each soldier consumes 2.5 kg per day . find the number of soldiers joining the fort in that case ? 
Options: a ) 273 , b ) 528 , c ) 539 , d ) 538 , e ) 723
Output (English): b