please help to find X

(ii) The following table represents the absent days and the number of students at each absent day, as follows Absent days 0 3 8 5 6 X Number of students 3 7 7 10 Y 5 3 Note: x is the greatest absent days. Find the unknown values X and Y which let the mean of the absent days equals 5.1 days and its median equals 5.5 days