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?
Please answer the following question by reasoning step-by-step.
27
Bobbie has 18 * 3 = 54 crayons.

Lizzie has 54 / 2 = 27 crayons.

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Final answer: 27