Roundtable
Some students are seat in a roundtable. There are girls who have on their right a girl and girls who have on their right a guy. of guys have on their right a girl. How many student are in the roundtable?
The answer is 35.
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1 solution
Note that there are 1 9 girl. For every girl who has a girl to her right is a girl who has a girl on her left. Then, there are 1 2 girls with a guy on her left. With this we have that there are 1 2 guys who have a girl on their right. Then there are 1 6 guys.
Total = 1 9 + 1 6 = 3 5