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?
How many crickets does Calvin have? ** With half as many crickets as roaches, he has 12/2=<<12/2=6>>6 crickets.
How many caterpillars does Calvin have? ** With twice as many caterpillars as scorpions, he has 3*2=<<3*2=6>>6 caterpillars.
How many insects does Calvin have in his collection? ** In total, he has 12+3+6+6=<<12+3+6+6=27>>27 insects in his bug collection.
#### 27