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18 Jan 2017, 06:42
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E
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91% (01:05) correct
9%
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A school is comprised of 400 people both teachers and students. If 10 percent of the people are teachers and 100 new people enter the school in the following year, how many of those people must be teachers to increase the percentage of teachers to 20 percent?
A. 10
B. 15
C. 25
D. 50
E. 60
A. 10
B. 15
C. 25
D. 50
E. 60
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18 Jan 2017, 07:12
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Out of 400, 10% are teachers. Therefore #teachers = 40
100 new people enter therefore total number of people =500
20% of 500 should be teachers = 100 should be teachers but 40 are already teachers.
Hence to increase the percentage of teachers to 20 percent, 60 of the new people should be teachers.
Therefore option E is correct.
100 new people enter therefore total number of people =500
20% of 500 should be teachers = 100 should be teachers but 40 are already teachers.
Hence to increase the percentage of teachers to 20 percent, 60 of the new people should be teachers.
Therefore option E is correct.
18 Jan 2017, 08:04
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Bunuel
A school is comprised of 400 people both teachers and students. If 10 percent of the people are teachers and 100 new people enter the school in the following year, how many of those people must be teachers to increase the percentage of teachers to 20 percent?
A. 10
B. 15
C. 25
D. 50
E. 60
no of teachers before 100people added = 10% of 400 =40A. 10
B. 15
C. 25
D. 50
E. 60
let x no of teachers required
40+x = 20% of (400+100)
40+x =100
x=60
Ans E
