Elijah and Ryan had 28 biscuits altogether. After Elijah ate ¹₃ of his biscuits and Ryan ate 7 biscuits, the number of biscuits Ryan had left was twice the number of biscuits Elijah had left. How many more biscuits did Ryan have than Elijah at first?

	Elijah	Ryan	Total
Before	3 u	4 u + 7	28
Change	- 1 u	- 7
After	2 u
Comparing Elijah and Ryan in the end	1x2 = 2 u	2x2 = 4 u

The number of biscuits that Elijah had in the end is the same. Make the number of biscuits that Elijah had in the end the same.  LCM of 2 and 1 is 2.

Total number of biscuits at first
= 3 u + 4 u + 7
= 7 u + 7

7 u + 7 = 28
7 u = 28 - 7
7 u = 21 

1 u = 21 ÷ 7 = 3

Number of biscuits that Elijah had at first
= 3 u
= 3 x 3
= 9

Number of biscuits that Ryan had at first
= 28 - 9
= 19

Number of biscuits that Ryan had more than Elijah at first
= 19 - 9
= 10

Answer(s): 10