50 x 2/5 = <<50*2/5=20>>20 posters are small.

And 50/2 = <<50/2=25>>25 posters are medium.

So 20 + 25 = <<20+25=45>>45 posters are not large.

Therefore, 50 - 45 = <<50-45=5>>5 posters are large.

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
A small store made 50 posters to advertise their products. Two-fifths of them are small posters while half of them are medium posters. The rest are large posters. How many large posters are there?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
5
A small store made 50 posters to advertise their products. Two-fifths of them are small posters while half of them are medium posters. The rest are large posters. How many large posters are there?
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