Ivy has 60 / 2 = 30 dolls. Ivy has 30 / 3 * 2 = 20 collectors edition dolls.
This justifies what answer for what question? Q & A:
Dina has 60 dolls. She has twice as many dolls as Ivy. 2/3 of Ivy's dolls are collectors editions. How many collectors edition dolls does Ivy have?
20