300 x 5/100 = <<300*5/100=15>>15 senior students got a full merit scholarship.

300 x 10/100 = <<300*10/100=30>>30 senior students got a half merit scholarship.

So, a total of 15 + 30 = <<15+30=45>>45 students got scholarships.

Therefore, 300 - 45 = <<300-45=255>>255 senior students did not get any scholarships.

# Answer

255
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Five percent of the 300 senior students got a full merit college scholarship and ten percent of them got a half merit scholarship. How many senior students did not get any scholarships?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
255
Five percent of the 300 senior students got a full merit college scholarship and ten percent of them got a half merit scholarship. How many senior students did not get any scholarships?
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