Task: Question Answering
Input (English): Problem: if the mean of numbers 28 , x , 42 , 78 and 104 is 62 , then what is the mean of 128 , 255 , 280 , 511 , 1023 and x ? 
Options: a ) 395 , b ) 375.8 , c ) 355 , d ) 415 , e ) 365
Output (English): b