The team is 40% girls because 100 - 60 = <<100-60=40>>40

The team has 20 girls because 50 x .4 = <<50*.4=20>>20

The team has 10 junior girls because 20 / 2 = <<20/2=10>>10

# Answer

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<|im_start|>system
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<|im_start|>user
Ben's hockey team is 60% boys and the rest are girls. Half the girls are juniors and the other half are seniors. If the team has 50 players, how many junior girls are there?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
10
Ben's hockey team is 60% boys and the rest are girls. Half the girls are juniors and the other half are seniors. If the team has 50 players, how many junior girls are there?
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