Sections A, B and C have mean scores 62, 70 and 80. Sections A and B together average 67, section B has 20 students, and all three sections together average 73.5. How many students are in section C?

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Accepted Answer

32. A and B: 62a+1400=67(a+20) 5a=60 a=12. All three: 744+1400+80c=73.5(32+c) 2144+80c=2352+73.5c 6.5c=208 c=32.

Sections A, B and C have mean scores 62, 70 and 80. Sections A and B together average 67, section B has 20 students, and all three sections together average 73.5. How many students are in section C?

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