Julie and Linda have some wafers each. If Julie gives Linda 18 wafers, Julie will have ²₉ as many wafers as Linda. If Julie gives Linda 15 wafers, they will have an equal number of wafers. How many wafers does Julie have at first?

	Case 1		Case 2
	Julie	Linda	Julie	Linda
Before	2 u + 18	9 u - 18	5.5 u + 15	5.5 u - 15
Change	- 18	+ 18	- 15	+ 15
After	2 u	9 u	5.5 u	5.5 u

Total number of wafers that Julie and Linda have
= 2 u + 9 u
= 11 u 

Number of wafers that Julie and Linda each has in the end is the same.

Number of wafers that Julie and Linda each has in the end in Case 2
= 11 u ÷ 2
= 5.5 u

Number of wafers that Julie had at first is the same in Case 1 and Case 2.

5.5 u + 15 = 2 u + 18
5.5 u - 2 u = 18 - 15
0.5 u = 3

1 u = 3 ÷ 0.5 = 6

Number of wafers that Julie has
= 2 u + 18
= 2 x 6 + 18
= 12 + 18
= 30

Answer(s): 30