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If none of the students are ambidextrous, what percentage of the 20 st

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If none of the students are ambidextrous, what percentage of the 20 st  [#permalink]

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New post Updated on: 15 Jan 2019, 07:29
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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?

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

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Originally posted by JusTLucK04 on 11 Apr 2014, 04:56.
Last edited by Bunuel on 15 Jan 2019, 07:29, edited 2 times in total.
Edited the question and added the OA
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Re: If none of the students are ambidextrous, what percentage of the 20 st  [#permalink]

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New post 11 Apr 2014, 05:37
JusTLucK04 wrote:
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

Kudos for the OA & OE.. :twisted:


Below is a matrix solution for the problem:
Attachment:
Untitled.png
Untitled.png [ 17.59 KiB | Viewed 4729 times ]

Answer: C.

Hope it helps.
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Re: If none of the students are ambidextrous, what percentage of the 20 st  [#permalink]

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New post 11 Apr 2014, 10:19
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Option C.
S1: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.Insuff.
S2:5 boys are left handed.But we don't know the total no. Of boys or girls from this.Insuff.

S1+S2:Suff as it provides all the required data.

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Re: If none of the students are ambidextrous, what percentage of the 20 st  [#permalink]

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New post 18 Aug 2015, 23:09
thanks for the solution . but do you think it is wrong if I calculate it in below way,

left handed girl = 25% of 12= 3
left handed boy = 20-12= 8-5= 3

total left handed= 6.
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Re: If none of the students are ambidextrous, what percentage of the 20 st  [#permalink]

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New post 29 Dec 2018, 07:51
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: If none of the students are ambidextrous, what percentage of the 20 st &nbs [#permalink] 29 Dec 2018, 07:51
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