human
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?
assistant
How many small posters are there? ** 50 x 2/5 = <<50*2/5=20>>20 posters are small.
How many medium posters are there? ** And 50/2 = <<50/2=25>>25 posters are medium.
How many small and medium posters are there? ** So 20 + 25 = <<20+25=45>>45 posters are not large.
How many large posters are there? ** Therefore, 50 - 45 = <<50-45=5>>5 posters are large.
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