Aida has twice as many dolls as Sophie, and Sophie has twice as many dolls as Vera. How many dolls do Aida, Sophie, and Vera have combined if Vera has 20 dolls?
How many dolls does Sophie have? ** If Sophie has twice as many dolls as Vera, then she has 2 * 20 dolls = <<2*20=40>>40 dolls
How many dolls does Aida have? ** Aida has 2 * 40 dolls = <<2*40=80>>80 dolls, twice the number Sophie has.
How many dolls do Aida, Sophie, and Vera have combined? ** In total, they have 80 dolls + 40 dolls + 20 dolls = <<80+40+20=140>>140 dolls
#### 140