"18"
To be contrary I would say that the answer is bit more complex than that.
The question is ambiguous as a "math, algebra, arithmetic" question; answers could be:
As an English usage question the answer is indeed generally agreed upon as being 18.
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A dozen is twelve; a half dozen is therefore six.
One dozen = 12 so half a dozen = 12/2 = 6. So simple!
One dozen of roses for $52 is better value than half a dozen roses for $30.
Two and a half dozen is equal to 30. Each dozen is 12, and a half a dozen is 6, so the equation you can use to figure that out is 12 x 2 + 6 = 30.
A dozen is twelve, half a dozen is 6.