Answer:
Kay sold 6 boxes and Ayan sold 19 boxes
Explanation:
Let x be the number of boxes sold by Kay and
Let y be the number of boxes sold by Ayan
Then according to given statements, the equations will be:

Putting x = y-13 in equation 1

Putting y = 19 in equation 2

So we get x=6 and y=19
Hence,
Kay sold 6 boxes and Ayan sold 19 boxes