Jen baked 80 cookies. ⁵₈ of the cookies were peach cookies. The rest were chocolate cookies. She gave an equal number of peach cookies and chocolate cookies away and had 2 times as many peach cookies as chocolate cookies left. How many cookies did she give away?

	Peach cookies	Chocolate cookies	Difference
Before	5x1 = 5 u	3x1 = 3 u	2x1 = 2 u
Change	- 1 u	- 1 u
After	2x2 = 4 u	1x2 = 2 u	1x2 = 2 u

Since Jen gave away an equal number of peach cookies and chocolate cookies, the difference in the number of peach cookies and chocolate cookies remains unchanged.  Make the difference in the peach cookies and chocolate cookies the same.  LCM of 2 and 1 is 2.

Total number of cookies at first
= 5 u + 3 u
= 8 u

8 u = 80

1 u = 80 ÷ 8 = 10

Number of cookies that Jen gave away
= 1 u + 1 u
= 2 u
= 2 x 10 
= 20

Answer(s): 20