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If none of the students are ambidextrous, what percentage of the 20 students in Mr. Henderson's class are left-handed?

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by BTGmoderatorDC » Wed Oct 21, 2020 5:51 pm

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Answers

A

B

C

D

E

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Difficulty—

If none of the students are ambidextrous, what percentage of the 20 students in Mr. Henderson's class are left-handed?

(1) Of the 12 girls in the class, 25% are left-handed.
(2) 5 of the boys in the class are right-handed


OA C

Source: Manhattan Prep
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Source: — Data Sufficiency |
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Re: If none of the students are ambidextrous, what percentage of the 20 students in Mr. Henderson's class are left-hande

by swerve » Fri Oct 23, 2020 4:35 pm
BTGmoderatorDC wrote: ↑
Wed Oct 21, 2020 5:51 pm
 If none of the students are ambidextrous, what percentage of the 20 students in Mr. Henderson's class are left-handed?

(1) Of the 12 girls in the class, 25% are left-handed.
(2) 5 of the boys in the class are right-handed


OA C

Source: Manhattan Prep
Statement 1:
We know out of \(20\) students, \(12\) are girls, so \(8\) are boys and out of \(12\) girls \(3\) are left handed but we don't know the data for boys. No sufficient \(\Large{\color{red}\chi}\)

Statement 2:
5 boys are left handed but we don't know the total number of boys or girls from this. No sufficient \(\Large{\color{red}\chi}\)

Combining both statements 1 & 2:
Sufficient as it provides all the required data. \(\Large{\color{green}\checkmark}\)

Therefore, C
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