With half as many crickets as roaches, he has 12/2=<<12/2=6>>6 crickets.

With twice as many caterpillars as scorpions, he has 3*2=<<3*2=6>>6 caterpillars.

In total, he has 12+3+6+6=<<12+3+6+6=27>>27 insects in his bug collection.

# Answer

27
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Calvin is a bug collector.  In his collection, he has 12 giant roaches, 3 scorpions, half as many crickets as roaches, and twice as many caterpillars as scorpions.  How many insects does Calvin have in his collection?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
27
Calvin is a bug collector.  In his collection, he has 12 giant roaches, 3 scorpions, half as many crickets as roaches, and twice as many caterpillars as scorpions.  How many insects does Calvin have in his collection?
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