human
Lizzie has half as many crayons as Bobbie. Bobbie has three times as many crayons as Billie. If Billie has 18 crayons, how many crayons does Lizzie have?
assistant
How many crayons does Bobbie have? ** Bobbie has 18 * 3 = <<18*3=54>>54 crayons.
How many crayons does Lizzie have? ** Lizzie has 54 / 2 = <<54/2=27>>27 crayons.
#### 27