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Bunuel
A certain collage has total of 400 seniors each majoring in exactly one of six subjects. A minimum of 20 seniors major in each six subjects. If three quarter of the seniors major in one of four subjects, what is the greatest possible number of seniors majoring in one of the other two subjects?

A. 100
B. 80
C. 75
D. 60
E. 50

total 400
for 4 subjects ; 3/4 * 400 ; 300
left with 100 for 2 subjects so max 100-20 ; 80
IMO B
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Total seniors: 400

A minimum of 20 seniors major in each six subjects: 6 * 20 = 120 seniors.

If three-quarters of the seniors major in one of four subjects: \(\frac{3}{4}* 400 = 300\) from 4 subjects which means 100 from the last two subjects (20 each).

For the greatest possible number of seniors majoring in one of the other two subjects: One of the subjects remains with a minimum of 20 seniors and the other becomes 80.

Answer B
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