This is a bonus question. If the modes of a problem are13 and15 and the mean and the median are 15 how do you come up with the other numbers
13 and 15 occur most frequently.
The center value is 15.
Depending on how many other numbers there are, just start putting them on both sides of 15 (the median), making sure they always add up to 15*n, where there are n numbers. And make sure that 13 and 15 occur the most.