Average

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There are 100 students in 3 sections A, B and C of a class. The average marks of all the 3 sections was 84. The average of B and C was 87.5 and the average marks of A is 70. The number of students in A was....
30
no
35
no
20
yes
25
no
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If the average of the number, its 80% and 20% is 360, then the number is?
360
no
400
no
540
yes
580
no
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