Originally, there were 90*2/3=<<90*2/3=60>>60 in the cafeteria.
Originally, there were 90-60=<<90-60=30>>30 outside the cafeteria.
Then 30*1/3=<<30*1/3=10>>10 ran inside
The number of students inside the cafeteria grew by 10-3=<<10-3=7>>7.
There are now 60+7=<<60+7=67>>67 students in the cafeteria.
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