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The student population of a certain school increased a% from
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05 Aug 2020, 11:34
05 Aug 2020, 11:34
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Question Stats:
54% (03:33) correct
45% (02:37) wrong based on 79 sessions
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The student population of a certain school increased a% from 1995 to 2005 and b% from 2005 to 2015. If the student population increased by 80% from 1995 to 2015 and the increase in the number of students in the second decade was three times the increase in the number of students in the first decade, what is the value of b?
A. 20
B. \(26 \frac{2}{3}\)
C. 50
D. 60
E. 75
A. 20
B. \(26 \frac{2}{3}\)
C. 50
D. 60
E. 75
Re: The student population of a certain school increased a% from
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18 Aug 2020, 22:06
18 Aug 2020, 22:06
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If the student population began with 100 students, it was 180 by the end of the full 20 year period.
Because a:b is 1:3, we divide the 80 additional students into group a, 20, and group b, 60. When 20 students were added the first ten years, it represented 20% of 100. When 60 students were added during the second period, it represented 50 percent of 120.
The answer is C.
Because a:b is 1:3, we divide the 80 additional students into group a, 20, and group b, 60. When 20 students were added the first ten years, it represented 20% of 100. When 60 students were added during the second period, it represented 50 percent of 120.
The answer is C.
Carcass wrote:
The student population of a certain school increased a% from 1995 to 2005 and b% from 2005 to 2015. If the student population increased by 80% from 1995 to 2015 and the increase in the number of students in the second decade was three times the increase in the number of students in the first decade, what is the value of b?
A. 20
B. \(26 \frac{2}{3}\)
C. 50
D. 60
E. 75
A. 20
B. \(26 \frac{2}{3}\)
C. 50
D. 60
E. 75
General Discussion
Re: The student population of a certain school increased a% from
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14 Sep 2022, 05:05
14 Sep 2022, 05:05
Can someone please share an explanation of this question ?
I got to the part where a=20 and b=60, but then I am confused on how the answer of the question is 50 ?
Does the last part of the stem "what is the value of b" mean that we need to input the number of students that increased in the second decade or the value of b as in b% ?
I got to the part where a=20 and b=60, but then I am confused on how the answer of the question is 50 ?
Does the last part of the stem "what is the value of b" mean that we need to input the number of students that increased in the second decade or the value of b as in b% ?
