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How to solve?

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Manager
Manager
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Joined: 19 Sep 2010
Posts: 56
Location: Pune, India
Followers: 13

Kudos [?]: 24 [0], given: 9

How to solve? [#permalink]

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New post 25 Jan 2011, 21:37
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Mark is as much younger to John as he is older to Jim.if the sum of the ages of John and Jim is 48 years,what is the present age of Mark?
A) 18 years
B) 36 Years
C) 24 Years
D) 28 Years

My solution is;

Let John age = a, Jim age = b
According to Ques; a+b= 48
factor of 48 = 24*2
= 8*6

I'm unable to understand what is next?Please explain it to me in detail?
Kaplan GMAT Instructor
User avatar
Joined: 21 Jun 2010
Posts: 148
Location: Toronto
Followers: 44

Kudos [?]: 172 [0], given: 0

Re: How to solve? [#permalink]

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New post 25 Jan 2011, 22:00
SoniaSaini wrote:
Mark is as much younger to John as he is older to Jim.if the sum of the ages of John and Jim is 48 years,what is the present age of Mark?
A) 18 years
B) 36 Years
C) 24 Years
D) 28 Years

My solution is;

Let John age = a, Jim age = b
According to Ques; a+b= 48
factor of 48 = 24*2
= 8*6

I'm unable to understand what is next?Please explain it to me in detail?


Hi,

what's the source of this question? It can't be from the actual GMAT (or GMAT materials), since there's only 4 answer choices. Also, the language is unidiomatic (at least for North American English).

In any case, we know that Mark's age is equidistant between John's and Jim's. If we wanted to solve algebraically, we'd say:

Mark - Jim = John - Mark

2(Mark) = John + Jim

Since we know that John + Jim = 48, we now know that:

2(Mark) = 48
Mark = 24

Of course, we didn't really need to use algebra if we used two of the most valuable tools in our GMAT arsenal: common sense and logic. If Mark is right in between John and Jim, then Mark's age must the average of John's and Jim's. Since:

Average = (sum of terms)/(# of terms)

we know that:

Mark = (48)/(2) = 24.
Manager
Manager
User avatar
Joined: 19 Sep 2010
Posts: 56
Location: Pune, India
Followers: 13

Kudos [?]: 24 [0], given: 9

Re: How to solve? [#permalink]

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New post 25 Jan 2011, 22:20
skovinsky wrote:
SoniaSaini wrote:
Mark is as much younger to John as he is older to Jim.if the sum of the ages of John and Jim is 48 years,what is the present age of Mark?
A) 18 years
B) 36 Years
C) 24 Years
D) 28 Years

My solution is;

Let John age = a, Jim age = b
According to Ques; a+b= 48
factor of 48 = 24*2
= 8*6

I'm unable to understand what is next?Please explain it to me in detail?


Hi,

what's the source of this question? It can't be from the actual GMAT (or GMAT materials), since there's only 4 answer choices. Also, the language is unidiomatic (at least for North American English).

In any case, we know that Mark's age is equidistant between John's and Jim's. If we wanted to solve algebraically, we'd say:

Mark - Jim = John - Mark

2(Mark) = John + Jim

Since we know that John + Jim = 48, we now know that:

2(Mark) = 48
Mark = 24

Of course, we didn't really need to use algebra if we used two of the most valuable tools in our GMAT arsenal: common sense and logic. If Mark is right in between John and Jim, then Mark's age must the average of John's and Jim's. Since:

Average = (sum of terms)/(# of terms)

we know that:

Mark = (48)/(2) = 24.


Skovinsky,

Thank you very much for your explanation.
yes, you're correct. I've taken this Q. from Quantum CAT book.
Please tell me should not I post any question (which belong to north American) on this forum?
Kaplan GMAT Instructor
User avatar
Joined: 21 Jun 2010
Posts: 148
Location: Toronto
Followers: 44

Kudos [?]: 172 [0], given: 0

Re: How to solve? [#permalink]

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New post 26 Jan 2011, 00:28
SoniaSaini wrote:

Skovinsky,

Thank you very much for your explanation.
yes, you're correct. I've taken this Q. from Quantum CAT book.
Please tell me should not I post any question (which belong to north American) on this forum?


Hi,

there are some non-GMAT questions that are useful for GMAT studiers as well, so there's no firm rule against posting non-GMAT questions. However, to ensure that no one gets confused, you should always include the source in your posts.

Stuart
Re: How to solve?   [#permalink] 26 Jan 2011, 00:28
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