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18 Oct 2019, 03:05
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C
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[GMAT math practice question]
The table shows the results of a Mathematics test in a class. The test range of 20% of the students in that class is between 70~80. How many students are there in that class?
10.18ps.png [ 7 KiB | Viewed 1767 times ]
A. 20
B. 23
C. 25
D. 26
E. 28
The table shows the results of a Mathematics test in a class. The test range of 20% of the students in that class is between 70~80. How many students are there in that class?
Attachment:
10.18ps.png [ 7 KiB | Viewed 1767 times ]
A. 20
B. 23
C. 25
D. 26
E. 28
18 Oct 2019, 04:51
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X/X+20 =1/5
5X=X+20
4X=20
X=5
So,5+20=25
Option C
Posted from my mobile device
5X=X+20
4X=20
X=5
So,5+20=25
Option C
Posted from my mobile device
20 Oct 2019, 19:14
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If \(x\) is the number of students with scores between \(70\) and \(80\), then we have \(\frac{x}{(x+20)} = \frac{20}{100}\) or \(100x = 20(x+20)\), and \(100x = 20x+400.\)
Then we have \(80x = 400.\)
So we have \(x = 5\), and the total number of students is \(5+20=25.\)
Therefore, C is the answer.
Answer: C
If \(x\) is the number of students with scores between \(70\) and \(80\), then we have \(\frac{x}{(x+20)} = \frac{20}{100}\) or \(100x = 20(x+20)\), and \(100x = 20x+400.\)
Then we have \(80x = 400.\)
So we have \(x = 5\), and the total number of students is \(5+20=25.\)
Therefore, C is the answer.
Answer: C
