BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

GMAT prep problem -How to get the answer

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |
User avatar
GMAT Instructor
Posts: 3225
Joined: Tue Jan 08, 2008 2:40 pm
Location: Toronto
Thanked: 1710 times
Followed by:614 members
GMAT Score:800

by Stuart@KaplanGMAT » Fri Aug 20, 2010 6:10 pm
manjus_mailme wrote:38,69,22,73,31,47,13,82

Which of the following numbers is greater than three fourths of the numbers but less than one-fourths of the numbers in the list above ?

I didn't note down all the 5 answer choices.But the correct answer is 71.Could anyone pls help me to arrive at the answer?
Hi,

the first thing you want to do on questions like this is order the list:

{13, 22, 31, 38, 47, 69, 73, 82}

Next, we see that there are 8 items on the list. Since 3/4 of 8 is 6, and 1/4 of 8 is 2, we want the number between the 6th and 7th numbers on the list.

#6 is 69
#7 is 73

So, the correct answer must be between 69 and 73.
Image

Stuart Kovinsky | Kaplan GMAT Faculty | Toronto

Kaplan Exclusive: The Official Test Day Experience | Ready to Take a Free Practice Test? | Kaplan/Beat the GMAT Member Discount
BTG100 for $100 off a full course
Top
Senior | Next Rank: 100 Posts
Posts: 37
Joined: Tue Feb 02, 2010 12:24 pm

by manjus_mailme » Sat Aug 21, 2010 10:53 am
Stuart Kovinsky wrote:
manjus_mailme wrote:38,69,22,73,31,47,13,82

Which of the following numbers is greater than three fourths of the numbers but less than one-fourths of the numbers in the list above ?

I didn't note down all the 5 answer choices.But the correct answer is 71.Could anyone pls help me to arrive at the answer?
Hi,

the first thing you want to do on questions like this is order the list:

{13, 22, 31, 38, 47, 69, 73, 82}

Next, we see that there are 8 items on the list. Since 3/4 of 8 is 6, and 1/4 of 8 is 2, we want the number between the 6th and 7th numbers on the list.

#6 is 69
#7 is 73

So, the correct answer must be between 69 and 73.

Thank you so much for the reply.Actually I was taking 3/4 th and 1/4th of each number and compared them .I got the wrong answer.Your solution is simply cool.
Top
Senior | Next Rank: 100 Posts
Posts: 37
Joined: Tue Feb 02, 2010 12:24 pm

by manjus_mailme » Tue Aug 24, 2010 1:12 pm
Stuart Kovinsky wrote:
manjus_mailme wrote:38,69,22,73,31,47,13,82

Which of the following numbers is greater than three fourths of the numbers but less than one-fourths of the numbers in the list above ?

I didn't note down all the 5 answer choices.But the correct answer is 71.Could anyone pls help me to arrive at the answer?
Hi,

the first thing you want to do on questions like this is order the list:

{13, 22, 31, 38, 47, 69, 73, 82}

Next, we see that there are 8 items on the list. Since 3/4 of 8 is 6, and 1/4 of 8 is 2, we want the number between the 6th and 7th numbers on the list.

#6 is 69
#7 is 73

So, the correct answer must be between 69 and 73.


I need one more clarification please.Since 1/4 of 8 is 2 .How did you decide that it is 7th no ?
Top
User avatar
GMAT Instructor
Posts: 3225
Joined: Tue Jan 08, 2008 2:40 pm
Location: Toronto
Thanked: 1710 times
Followed by:614 members
GMAT Score:800

by Stuart@KaplanGMAT » Tue Aug 24, 2010 1:27 pm
manjus_mailme wrote:I need one more clarification please.Since 1/4 of 8 is 2 .How did you decide that it is 7th no ?
Since 1/4 of the terms are above the number we want, and since there are 8 terms, there will be:

(1/4)(8) = 2 terms above the correct answer.

Since there are 8 terms total, the 2 terms above must be the 8th and 7th terms in the sequence.
Image

Stuart Kovinsky | Kaplan GMAT Faculty | Toronto

Kaplan Exclusive: The Official Test Day Experience | Ready to Take a Free Practice Test? | Kaplan/Beat the GMAT Member Discount
BTG100 for $100 off a full course
Top
Senior | Next Rank: 100 Posts
Posts: 37
Joined: Tue Feb 02, 2010 12:24 pm

by manjus_mailme » Wed Aug 25, 2010 8:44 am
Thank you for the explanation.

Stuart Kovinsky wrote:
manjus_mailme wrote:I need one more clarification please.Since 1/4 of 8 is 2 .How did you decide that it is 7th no ?
Since 1/4 of the terms are above the number we want, and since there are 8 terms, there will be:

(1/4)(8) = 2 terms above the correct answer.

Since there are 8 terms total, the 2 terms above must be the 8th and 7th terms in the sequence.
Top
Post new topic Post Reply
• Page 1 of 1