The cigars

Puzzle Question:

Because cigars cannot be entirely smoked, a Bobo who collects cigar butts can make a cigar to smoke out of every 3 butts that he finds.
Today, he has collected 27 cigar butts. How many cigars will he be able to smoke?

Answer --

Solution of Puzzle:

13 not 12
He makes 9 originals from the 27 butts he found, and after he smokes them he has 9 butts left for another 3 cigars. And then he has 3 butts for another cigar.
So 9+3+1=13

Toughness:

Intermediate