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Of 40 numbers in a list, 10 numbers are between 15 and 20 an
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24 Aug 2020, 10:20
24 Aug 2020, 10:20
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Question Stats:
70% (01:01) correct
30% (01:18) wrong based on 40 sessions
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Of 40 numbers in a list, 10 numbers are between 15 and 20 and the remaining 30 numbers are between 50 and 60.
A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.
Quantity A |
Quantity B |
The arithmetic mean of the 40 numbers |
55 |
A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.
Re: Of 40 numbers in a list, 10 numbers are between 15 and 20 an
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24 Aug 2020, 10:21
24 Aug 2020, 10:21
Expert Reply
Post A Detailed Correct Solution For The Above Questions And Get A Kudos.
Question From Our New Project: GRE Quant Challenge Questions Daily - NEW EDITION!
For more theory and practice see our GRE - Math Book
Question From Our New Project: GRE Quant Challenge Questions Daily - NEW EDITION!
For more theory and practice see our GRE - Math Book
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Re: Of 40 numbers in a list, 10 numbers are between 15 and 20 an
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24 Aug 2020, 14:07
24 Aug 2020, 14:07
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Carcass wrote:
Of 40 numbers in a list, 10 numbers are between 15 and 20 and the remaining 30 numbers are between 50 and 60.
A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.
Quantity A |
Quantity B |
The arithmetic mean of the 40 numbers |
55 |
A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.
The biggest possible arithmetic mean is \(\frac{{10 \cdot 20 + 30 \cdot 60}}{40} = \frac{{200 + 1800}}{40} = \frac{2000 }{ 40} = 50\), which is less than \(55\).
Thus all possible arithmetic mean is less than or equal to \(50\) and they are less than \(B = 55\).
Then, \(A\) is always less than \(B\).
Therefore, B is the right answer.
