Stream of consciousness rationale: Ivy has 20 / 2 * 3 = 30 dolls. Dina has 30 * 2 = 60 dolls.
The question and answer pair are described below.
Q: Dina has twice as many dolls as Ivy. 2/3 of Ivy's dolls are collectors editions. If Ivy has 20 collectors edition dolls, how many dolls does Dina have?
A: 60