Use reasoning to answer the following question.
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?

300
If there were 200 students on the field and 3 / 4 of the students looked up at the flying plane, 3 / 4 * 200 = 150 students saw the plane.

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

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The answer is 300