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M22-18

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M22-18 [#permalink]

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If 50% of a factory's workers are not older than 30 years old, what percent of the factory workers are younger than 40 years old?


(1) 30% of the factory workers are older than 30 but younger than 40 years old

(2) 20% of the factory workers are at least 40 years old
[Reveal] Spoiler: OA

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Re M22-18 [#permalink]

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Re: M22-18 [#permalink]

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New post 15 Feb 2016, 08:05
Dear Bunuel /others

Just one doubt-
Second statement says 20% is atleast 40 so the rest of people can be 40 or >40 right.. or it can be <30 as well so how are we doing 100-20 percent?
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Re: M22-18 [#permalink]

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seemachandran wrote:
Dear Bunuel /others

Just one doubt-
Second statement says 20% is atleast 40 so the rest of people can be 40 or >40 right.. or it can be <30 as well so how are we doing 100-20 percent?



Hi,
the statement says 20% are atleast 40..
this means these 20% are 40 or>40...


Quote:
the rest of people can be 40 or >40 right


this would be the case, if the statement read..
atleast 20% are 40 years or more

hope it helps
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Re: M22-18 [#permalink]

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New post 15 Feb 2016, 08:37
Thanks Chetan2u got a little confused.
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Re: M22-18 [#permalink]

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New post 18 Jul 2016, 20:57
As statement 1 tells there are older than 30 year and younger than 40 but there can be workers with edge of 30 year . why we are not considering it.
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Re: M22-18 [#permalink]

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New post 18 Jul 2016, 23:07
anujsabre wrote:
As statement 1 tells there are older than 30 year and younger than 40 but there can be workers with edge of 30 year . why we are not considering it.


Those who are exactly 30 years old are included in 50% who are not older than 30 years old.
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Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: M22-18 [#permalink]

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New post 26 Nov 2016, 11:02
chetan2u wrote:
seemachandran wrote:
Dear Bunuel /others

Just one doubt-
Second statement says 20% is atleast 40 so the rest of people can be 40 or >40 right.. or it can be <30 as well so how are we doing 100-20 percent?



Hi,
the statement says 20% are atleast 40..
this means these 20% are 40 or>40...


Quote:
the rest of people can be 40 or >40 right


this would be the case, if the statement read..
atleast 20% are 40 years or more

hope it helps


Why did we add up in Statement 1? Please check my matrix and let me know where I am going wrong ?
>> !!!

You do not have the required permissions to view the files attached to this post.

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Re: M22-18 [#permalink]

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New post 03 Jul 2017, 11:46
Mbawarrior01 wrote:
chetan2u wrote:
seemachandran wrote:
Dear Bunuel /others

Just one doubt-
Second statement says 20% is atleast 40 so the rest of people can be 40 or >40 right.. or it can be <30 as well so how are we doing 100-20 percent?



Hi,
the statement says 20% are atleast 40..
this means these 20% are 40 or>40...


Quote:
the rest of people can be 40 or >40 right


this would be the case, if the statement read..
atleast 20% are 40 years or more

hope it helps


Why did we add up in Statement 1? Please check my matrix and let me know where I am going wrong ?


Hi Bunuel
I have the same doubt. Could you please clarify?
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M22-18 [#permalink]

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The tricky thing here is the wording of the problem. I too got foxed in the first attempt. But, if we organize the data correctly - It becomes easier to "See" the answer. Please see the snapshot for details.

Attachment:
M22-18.png


Both statements are suff. Answer choice D
>> !!!

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Re: M22-18 [#permalink]

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New post 18 Jan 2018, 00:42
(1) by itself is sufficient. The answer is 50%+30%=80%50%+30%=80%.
(2) by itself is sufficient. The answer is 100%−20%=80%100%−20%=80%.
Re: M22-18   [#permalink] 18 Jan 2018, 00:42
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