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The average number of students per class at School X is 25 and the ave

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The average number of students per class at School X is 25 and the ave  [#permalink]

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New post 10 Jan 2019, 02:06
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63% (01:33) correct 37% (01:45) wrong based on 30 sessions

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The average number of students per class at School X is 25 and the average number of students per class at School Y is 33. Is the average number of students per class for both schools combined less than 29?

1) There are 12 classes in school X.
2) There are more classes in school X than in school Y.

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The average number of students per class at School X is 25 and the ave  [#permalink]

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New post 10 Jan 2019, 04:51
The average number of students per class at School X is 25 and the average number of students per class at School Y is 33. Is the average number of students per class for both schools combined less than 29?

(33+25)/2 = 29
At least equal number of students per class in school x and equal number of students per class in school y should be present for combined average to be 29
OR
Y >x


1) There are 12 classes in school X.
No information about Y
Insufficient

2) There are more classes in school X than in school Y.
From above explanation X > Y, implies avg of students both classes combines is < 29
Sufficient

Option B is correct
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The average number of students per class at School X is 25 and the ave &nbs [#permalink] 10 Jan 2019, 04:51
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The average number of students per class at School X is 25 and the ave

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