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16 Oct 2019, 00:59
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C
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Difficulty:
5%
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Question Stats:
98% (01:17) correct
2%
(03:16)
wrong
based on 124
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In a certain school, there are 160 boys and 240 girls. If 15 percent of the boys are left-handed and 25 percent of the girls are left-handed, what percent of the school`s entire student population is left-handed?
A. 18
B. 20
C. 21
D. 23
E. 24
A. 18
B. 20
C. 21
D. 23
E. 24
16 Oct 2019, 01:14
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Bunuel
Total left-handed students = 15% of boys + 25% of girls = \(\frac{15}{100}*160 + \frac{25}{100}*240 = 24 + 60 = 84\)
what percent of the school`s entire student population is left-handed
--> \(x\) % of \(400 = 84\)
--> \(\frac{x}{100}*400 = 84\)
--> \(x = \frac{84}{4} = 21\)
IMO Option C
Archit3110
Major Poster
16 Oct 2019, 05:01
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Bunuel
2x2 matrix
--- B---G----total
LH--24--60--84
RH--136--180--316
total--160--240--400
LH ; 84/400 ; 21% IMO C
