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?
If there were 200 students on the field and 3/4 of the students looked up at the flying plane, 3/4*200 = 
<gadget id="calculator">3/4*200</gadget>
<output>150</output>
150 students saw the plane.
Since each student has two eyes, the number of eyes that looked at the plane is 2*150 = 
<gadget id="calculator">2*150</gadget>
<output>300</output>
300 years.

<result>300</result>