If there were 200 students on the field and 3/4 of the students looked up at the flying plane, 3/4*200 = <<3/4*200=150>>150 students saw the plane.

Since each student has two eyes, the number of eyes that looked at the plane is 2*150 = <<2*150=300>>300 years.

# Answer

300
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
There were 200 students on a field playing football. Suddenly a military plane flew by, and 3/4 of the students looked up. How many eyes saw the airplane?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
300
There were 200 students on a field playing football. Suddenly a military plane flew by, and 3/4 of the students looked up. How many eyes saw the airplane?
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