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07 Jan 2019, 04:33
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Difficulty:
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Question Stats:
77% (01:19) correct
23%
(01:39)
wrong
based on 188
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One class in a school is 30 percent boys. If a second class that is half the size of the first is 40 percent boys, what percent of both classes are boys?
A. 20%
B. 25%
C. 28%
D. 30%
E. 100/3%
A. 20%
B. 25%
C. 28%
D. 30%
E. 100/3%
Archit3110
07 Jan 2019, 04:36
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Bunuel
let class be 30 students = 9 boys
and other be 15 students = 6 boys
total 15/45 = 33.3% IMO E
hsn81960
Joined: 16 May 2018
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16 Jan 2019, 06:49
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Bunuel :
why cant i do the same by assuming 100 as total number of students?
100.
Class A: 30% boys =30
Class B: 50..so 40% of 50 =20
30+20=50
50/100= 1/2
why cant i do the same by assuming 100 as total number of students?
100.
Class A: 30% boys =30
Class B: 50..so 40% of 50 =20
30+20=50
50/100= 1/2
