Anne is 2 times as tall as her sister hence 2*(her sister's height) = 80cm
Her sister's height = 80cm/2 = <<80/2=40>>40cm
Bella is 3 times as tall as Anne hence Bella's height is 3*80 cm = <<3*80=240>>240 cm
The height difference between Bella and Anne's sister = 240-40 = <<240-40=200>>200cm
#### 200