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If the numbers 17/24, 1/2, 3/8, 3/4, and 9/16 were ordered

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If the numbers 17/24, 1/2, 3/8, 3/4, and 9/16 were ordered [#permalink] New post 19 Jan 2014, 22:50
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The Official Guide For GMAT® Quantitative Review, 2ND Edition

If the numbers 17/24, 1/2, 3/8, 3/4, and 9/16 were ordered from greatest to least, the middle number of the resulting sequence would be

(A) 17/24
(B) 1/2
(C) 3/8
(D) 3/4
(E) 9/16

Problem Solving
Question: 48
Category: Arithmetic Operations on rational numbers
Page: 68
Difficulty: 550


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Re: If the numbers 17/24. 1/2, 3/8, 3/4, and 9/16 were ordered [#permalink] New post 19 Jan 2014, 22:50
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SOLUTION

If the numbers 17/24, 1/2, 3/8, 3/4, and 9/16 were ordered from greatest to least, the middle number of the resulting sequence would be

(A) 17/24
(B) 1/2
(C) 3/8
(D) 3/4
(E) 9/16

The least common denominator for all the fractions above is 48:

\frac{17}{24}=\frac{34}{48}, \frac{1}{2}=\frac{24}{48}, \frac{3}{8}=\frac{18}{48}, \frac{3}{4}=\frac{36}{48}, \frac{9}{16}=\frac{27}{47}.

The numerators in descending order are: 36, 34, 27, 24, 18. The middle number is 27, which corresponds to \frac{9}{16}=\frac{27}{47}.

Answer: E.
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Re: If the numbers 17/24, 1/2, 3/8, 3/4, and 9/16 were ordered [#permalink] New post 19 Jan 2014, 23:36
[quote="Bunuel"]The Official Guide For GMAT® Quantitative Review, 2ND Edition

If the numbers 17/24, 1/2, 3/8, 3/4, and 9/16 were ordered from greatest to least, the middle number of the resulting sequence would be

(A) 17/24
(B) 1/2
(C) 3/8
(D) 3/4
(E) 9/16

17/24, 1/2, 3/8, 3/4, and 9/16 - Multiply all the fractions by 48 we get: 34, 24, 18, 36, 27

So 36 is the greatest which is 3/4
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Re: If the numbers 17/24, 1/2, 3/8, 3/4, and 9/16 were ordered [#permalink] New post 20 Jan 2014, 01:00
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Bunuel wrote:
The Official Guide For GMAT® Quantitative Review, 2ND Edition

If the numbers 17/24, 1/2, 3/8, 3/4, and 9/16 were ordered from greatest to least, the middle number of the resulting sequence would be

(A) 17/24
(B) 1/2
(C) 3/8
(D) 3/4
(E) 9/16

Problem Solving
Question: 48
Category: Arithmetic Operations on rational numbers
Page: 68
Difficulty: 550


GMAT Club is introducing a new project: The Official Guide For GMAT® Quantitative Review, 2ND Edition - Quantitative Questions Project

Each week we'll be posting several questions from The Official Guide For GMAT® Quantitative Review, 2ND Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

We'll be glad if you participate in development of this project:
1. Please provide your solutions to the questions;
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

Thank you!




Take LCM of denominators and get common denominator to all fractions so that you can compare the numerators and arrange in the increasing or decreasing order

LCM of denominators is 48

fractions can be rewritten as
34/48,24/48,18/48,36/48,27/48.
now arrange them
18/48,24/48,27/48,34/48,36/48
hence the middle element is 27/48=9/16
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Re: If the numbers 17/24, 1/2, 3/8, 3/4, and 9/16 were ordered [#permalink] New post 20 Jan 2014, 19:27
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Easiest way to solve this type of question is to find a common multiplier for denominators of all the given number.
As we can see that the Common Factor for all the denominators- 24,2,4,8,16 is 48 .
Multiply each number by 48-
(17/24)*48 = 34
(1/2)*48 = 24
(3/8)*48 = 18
(3/4)*48 = 36
(9/16)*48 =27

So the given number becomes - 34,24,18,36,27

In descending order - 36,34,27,24,18

So mid-number is 27 .
Now again to get the required answer divide it by 48 -> 27/48 = 9/16

So answer is (E)

Note: Although the explanation may look lengthy but when we do it pen-paper it will not take more that 15 sec.
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Re: If the numbers 17/24, 1/2, 3/8, 3/4, and 9/16 were ordered [#permalink] New post 20 Jan 2014, 20:34
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Approach 1:
Here, taking LCM for all the denominators, as others suggested, would be a good idea.

Approach 2:
Alternatively, if we are little good at approximation, looking at the numbers, we can say that 3/8 is the least and 3/4 is the greatest. Comparing 17/24 and 9/16 will be the slightly trickiest thing in this problem.

9/16 will be a little more than half(1/2).
17/24 will be a little less than 3/4 as 18/24 will give 3/4.

So, if we arrange from greatest to least, the order will be 3/4, 17/24, 9/16, 1/2, 3/8. Since we are asked for the middle element, 9/16 will be the answer.

Ans is (E).
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Re: If the numbers 17/24, 1/2, 3/8, 3/4, and 9/16 were ordered [#permalink] New post 21 Jan 2014, 03:58
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Ans should be (e)..9/16
We can see the other nos relative to 1/2 i.e. 50%.
Just by seeing numerator and denominator 3/4 and 3/8 can be placed on either side of 1/2. 17/24 and 9/16 are definitely greater than 1/2.
So, to check which no comes in 3rd place, we can individually compute their values and see that 9/16 is smaller than 17/24.
So 9/16 must be at the 3rd spot and thus, the middle no.
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Re: If the numbers 17/24, 1/2, 3/8, 3/4, and 9/16 were ordered [#permalink] New post 23 Jan 2014, 05:23
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Correct Sequence in descending order should be
3/4 ,17/24,9/16,1/2,3/8
hence middle term is 9/16

answer E
Find the common denominator then compare.
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Re: If the numbers 17/24, 1/2, 3/8, 3/4, and 9/16 were ordered [#permalink] New post 25 Jan 2014, 10:50
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SOLUTION

If the numbers 17/24, 1/2, 3/8, 3/4, and 9/16 were ordered from greatest to least, the middle number of the resulting sequence would be

(A) 17/24
(B) 1/2
(C) 3/8
(D) 3/4
(E) 9/16

The least common denominator for all the fractions above is 48:

\frac{17}{24}=\frac{34}{48}, \frac{1}{2}=\frac{24}{48}, \frac{3}{8}=\frac{18}{48}, \frac{3}{4}=\frac{36}{48}, \frac{9}{16}=\frac{27}{47}.

The numerators in descending order are: 36, 34, 27, 24, 18. The middle number is 27, which corresponds to \frac{9}{16}=\frac{27}{47}.

Answer: E.
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NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

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: If the numbers 17/24, 1/2, 3/8, 3/4, and 9/16 were ordered   [#permalink] 25 Jan 2014, 10:50
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