Task: Question Answering
Input (English): Question: 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?

 Option A: 395

 Option B: 375.8

 Option C: 355

 Option D: 415

 Option E: 365
Output (English): Option B