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? Let's be accurate as possible.
Ivy has 20 / 2 * 3 = 30 dolls. Dina has 30 * 2 = 60 dolls.
The answer: 60.