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A group of students take a test and the average score is 90. One more
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20 May 2021, 09:41
20 May 2021, 09:41
Expert Reply
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Question Stats:
77% (01:03) correct
22% (01:24) wrong based on 22 sessions
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A group of students take a test and the average score is 90. One more student takes the test and receives a score of 81 decreasing the average score of the group to 87.
A. Quantity A is greater.
B. Quantity B is greater.
C. The two quantities are equal.
D. The relationship cannot be determined from the information given.
Quantity A |
Quantity B |
The number of students in the initial group |
3 |
A. Quantity A is greater.
B. Quantity B is greater.
C. The two quantities are equal.
D. The relationship cannot be determined from the information given.
Re: A group of students take a test and the average score is 90. One more
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20 May 2021, 10:46
20 May 2021, 10:46
initial no. of student who took test is n=1,right!!!
Re: A group of students take a test and the average score is 90. One more
[#permalink]
20 May 2021, 20:00
20 May 2021, 20:00
1
Take initial students \(x\)
\(90x + 81 = 87 (x+1)\)
\(90x + 81 = 87x + 87\)
\(3x = 6\)
\(x = 2\)
Answer B
\(90x + 81 = 87 (x+1)\)
\(90x + 81 = 87x + 87\)
\(3x = 6\)
\(x = 2\)
Answer B
