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Answer: 5 girls (in a class of 11)

 

 Girls  Class  % girls
 1  2  50%
 2  4  50%
 5  40%
 3  7  $\frac37$ = 42.9%
 8  $\frac38$ = 37.5%
 4  9  44.4...%
 5  11  45.4545%

 

 

 

 

 

 

 

This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.