Perry and Oscar had 69 cookies altogether. After Perry ate ¹₄ of his cookies and Oscar ate 9 cookies, the number of cookies Oscar had left was twice the number of cookies Perry had left. How many more cookies did Oscar have than Perry at first?

	Perry	Oscar	Total
Before	4 u	6 u + 9	69
Change	- 1 u	- 9
After	3 u
Comparing Perry and Oscar in the end	1x3 = 3 u	2x3 = 6 u

The number of cookies that Perry had in the end is the same. Make the number of cookies that Perry had in the end the same.  LCM of 3 and 1 is 3.

Total number of cookies at first
= 4 u + 6 u + 9
= 10 u + 9

10 u + 9 = 69
10 u = 69 - 9
10 u = 60 

1 u = 60 ÷ 10 = 6

Number of cookies that Perry had at first
= 4 u
= 4 x 6
= 24

Number of cookies that Oscar had at first
= 69 - 24
= 45

Number of cookies that Oscar had more than Perry at first
= 45 - 24
= 21

Answer(s): 21