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# How many members of Group G are less than 25 years of age?

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Senior Manager
Joined: 02 Jan 2017
Posts: 307
How many members of Group G are less than 25 years of age?  [#permalink]

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22 Feb 2017, 17:27
00:00

Difficulty:

15% (low)

Question Stats:

75% (00:46) correct 25% (00:54) wrong based on 105 sessions

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How many members of Group G are less than 25 years of age?

(1) Exactly 3/5 of the members of Group G are 25 years of age or older.
(2) The 24 men in Group G constitute 30 percent of the groups membership
Current Student
Joined: 02 Jul 2017
Posts: 293
Concentration: Entrepreneurship, Technology
GMAT 1: 730 Q50 V38
Re: How many members of Group G are less than 25 years of age?  [#permalink]

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02 Sep 2017, 01:13
Here as question is asking about number of men less than 25 of age... and not the percentage.. we need to know exact number of members in Group G.

1) 3/5th of members are of age 25 or more.
This tells us that 2/5th of members in Group G are of age 25 or less. But here we know % number and not the exact number.
So Not Sufficient.

2) 24 men = 30% of members in G.
So we can calculate total number of members in G.
But here we have no information about there age.
So Not Sufficient.

1+2
by 1 we know % of people of age less than 25 and by 2 we get to know total number of members in Group G.
So by combining both we can calculate no. of people in Group G who are less than 25 of age.

Math Expert
Joined: 02 Aug 2009
Posts: 7202
Re: How many members of Group G are less than 25 years of age  [#permalink]

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04 Nov 2017, 23:43
Rachelpaw wrote:
Below one is question.

How many members of Group G are less than 25 years of age?

(1) Exactly 3/5 of the members of group G are 25 years of age or older
(2) The 24 men in group G constitute 30 percent of the group's membership

I can figure out # of group using (2) which is 80 and
# of 25 years of age or older is 48. # of Under 25 years of age is 32.
But how could I know # of less than 25 years of age with 2 statements? I can't figure out # of exact 25 years of age.

So I choose statements (1) and (2) together are not sufficient because I don't know # of 25 years age separately.
but the answer is Both statements together are sufficient, but neither statement alone is sufficient.

HI...
you can have two statements of this kind..
1) people LESS than age of 25
2) People GREATER than age of 25..

so where do you put EQUAL to 25 in above statements - Either both or none
you put in both, you are repeating , so it is NONE

also x LESS than 25 means x<25.. so how can you have 25 in it..

now statement 1 says -

(1) Exactly 3/5 of the members of group G are 25 years of age or older
so three categories.. less than, equal to and greater than
here 3/5 includes equal to and greater than, so left is 2/5 and this tells 2/5 are third category- less than 25
but we do not know how many are total
insuff

(2) it gives you total but not ratio..
insuff

combined
2/5 of 80 = 32
suff
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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html

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Re: How many members of Group G are less than 25 years of age &nbs [#permalink] 04 Nov 2017, 23:43
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