December 10, 2018 December 10, 2018 10:00 PM PST 11:00 PM PST Practice the one most important Quant section  Integer properties, and rapidly improve your skills. December 11, 2018 December 11, 2018 09:00 PM EST 10:00 PM EST Strategies and techniques for approaching featured GMAT topics. December 11 at 9 PM EST.
Author 
Message 
TAGS:

Hide Tags

Manager
Joined: 09 Jul 2010
Posts: 87

In the decimal 3.1de, d and e each represent a digit. If x
[#permalink]
Show Tags
Updated on: 30 May 2013, 23:53
Question Stats:
68% (01:00) correct 32% (01:06) wrong based on 300 sessions
HideShow timer Statistics
In the decimal 3.1de, d and e each represent a digit. If x represents the decimal 3.1de rounded to the nearest tenth, what is the value of x? (1) d=4 (2) e=8
Official Answer and Stats are available only to registered users. Register/ Login.
Originally posted by raviram80 on 20 May 2012, 20:51.
Last edited by Bunuel on 30 May 2013, 23:53, edited 3 times in total.
Renamed the topic and edited the question.




Math Expert
Joined: 02 Sep 2009
Posts: 51072

Re: In the decimal 3.1de, d and e each represent a digit. If x
[#permalink]
Show Tags
06 Jul 2012, 03:43
ga99 wrote: Shouldn't the answer be C: both needed to answer.
Since d is 4 as per statement 1, the approximation also depends on e. If e=0  4, then x is 3.1. If e=5  9, then the x is 3.2. e would not matter only if d < 4. Rounding rulesRounding is simplifying a number to a certain place value. To round the decimal drop the extra decimal places, and if the first dropped digit is 5 or greater, round up the last digit that you keep. If the first dropped digit is 4 or smaller, round down (keep the same) the last digit that you keep.Example: 5.3485 rounded to the nearest tenth = 5.3, since the dropped 4 is less than 5. 5.3485 rounded to the nearest hundredth = 5.35, since the dropped 8 is greater than 5. 5.3485 rounded to the nearest thousandth = 5.349, since the dropped 5 is equal to 5. BACK TO THE ORIGINAL QUESTION: In the decimal 3.1de, d and e each represent a digit. If x represents the decimal 3.1de rounded to the nearest tenth, what is the value of x?According to the rule above the tenth digit of x depends only on d, since it's the first dropped digit. (1) d=4. Our decimal is 3.14e > the first dropped digit is 4, so less than 5, hence 3.14e rounded to the nearest tenth is 3.1. Sufficient. (2) e=8. Clearly not sufficient. Answer: A. Hope it's clear.
_________________
New to the Math Forum? Please read this: Ultimate GMAT Quantitative Megathread  All You Need for Quant  PLEASE READ AND FOLLOW: 12 Rules for Posting!!! Resources: GMAT Math Book  Triangles  Polygons  Coordinate Geometry  Factorials  Circles  Number Theory  Remainders; 8. Overlapping Sets  PDF of Math Book; 10. Remainders  GMAT Prep Software Analysis  SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS)  Tricky questions from previous years.
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.
What are GMAT Club Tests? Extrahard Quant Tests with Brilliant Analytics




Intern
Joined: 01 Apr 2012
Posts: 26
Location: United States
Concentration: Technology, Economics
GMAT Date: 05132012
WE: Consulting (Computer Software)

Re: Rounded to nearest tenth
[#permalink]
Show Tags
20 May 2012, 21:20
1. d=4.. so the number is 3.14e...... we are suppose to round off to the nearest tenth....so tenth digit is 4 which will be rounded off to 3.1....we are not bothered about e.
2. e= 8
Here the number can be 3.118 whcih will be rounded off to 3.1 or 3.158 which will be rounded off to 3.2......as we are not sure of the value of d we are not sure ...it can have different values.
so the correct answer is A



Manager
Joined: 30 Jun 2011
Posts: 201

Re: In the decimal 3.1de, d and e each represent a digit. If x
[#permalink]
Show Tags
22 May 2012, 07:38
raviram80 wrote: In the decimal 3.1de, d and e each represent a digit. If x represents the decimal 3.1de rounded to the nearest tenth, what is the value of
(1) d=4 (2) e=8
Folks,
could you clarify this question, I thought E but Gmat prep software says A. I am confused.
Thanks We need to find out whether d belongs to 04 category or 59 category. We get this from i) but not from ii). So, A



Intern
Joined: 06 Apr 2011
Posts: 6

Re: In the decimal 3.1de, d and e each represent a digit. If x
[#permalink]
Show Tags
06 Jul 2012, 02:27
Shouldn't the answer be C: both needed to answer.
Since d is 4 as per statement 1, the approximation also depends on e. If e=0  4, then x is 3.1. If e=5  9, then the x is 3.2. e would not matter only if d < 4.



Intern
Joined: 06 Apr 2011
Posts: 6

Re: In the decimal 3.1de, d and e each represent a digit. If x
[#permalink]
Show Tags
06 Jul 2012, 05:31
Its clear now. I was always rounding based on all the digits from right to left and not taking just the first dropped digit. For e.g. in your example of "5.3485 rounded to the nearest tenth = 5.3, since the dropped 4 is less than 5." I would always have picked 5.4 I now see how that might not work. Thanks for the explanation. I overlooked this while preparing. Bunuel wrote: ga99 wrote: Shouldn't the answer be C: both needed to answer.
Since d is 4 as per statement 1, the approximation also depends on e. If e=0  4, then x is 3.1. If e=5  9, then the x is 3.2. e would not matter only if d < 4. Rounding rulesRounding is simplifying a number to a certain place value. To round the decimal drop the extra decimal places, and if the first dropped digit is 5 or greater, round up the last digit that you keep. If the first dropped digit is 4 or smaller, round down (keep the same) the last digit that you keep.Example: 5.3485 rounded to the nearest tenth = 5.3, since the dropped 4 is less than 5. 5.3485 rounded to the nearest hundredth = 5.35, since the dropped 8 is greater than 5. 5.3485 rounded to the nearest thousandth = 5.349, since the dropped 5 is equal to 5. BACK TO THE ORIGINAL QUESTION: In the decimal 3.1de, d and e each represent a digit. If x represents the decimal 3.1de rounded to the nearest tenth, what is the value ofAccording to the rule above the tenth digit of x depends only on d, since it's the first dropped digit. (1) d=4. Our decimal is 3.14e > the first dropped digit is 4, so less than 5, hence 3.14e rounded to the nearest tenth is 3.1. Sufficient. (2) e=8. Clearly not sufficient. Answer: A. Hope it's clear.



Manager
Joined: 03 Mar 2013
Posts: 72
Location: India
Concentration: General Management, Marketing
GPA: 3.49
WE: Web Development (Computer Software)

Re: In the decimal 3.1de, d and e each represent a digit. If x
[#permalink]
Show Tags
23 May 2013, 07:37
raviram80 wrote: In the decimal 3.1de, d and e each represent a digit. If x represents the decimal 3.1de rounded to the nearest tenth, what is the value of
(1) d=4 (2) e=8
Folks,
could you clarify this question, I thought E but Gmat prep software says A. I am confused.
Thanks dude here is the logic if d = 4, then when u round it, we do get a value of 3.2 so its sufficient 2. s2 is not sufficient. hence a is fine



CEO
Status: GMATINSIGHT Tutor
Joined: 08 Jul 2010
Posts: 2710
Location: India
GMAT: INSIGHT
WE: Education (Education)

Re: In the decimal 3.1de, d and e each represent a digit. If x
[#permalink]
Show Tags
09 Jul 2015, 11:05
raviram80 wrote: In the decimal 3.1de, d and e each represent a digit. If x represents the decimal 3.1de rounded to the nearest tenth, what is the value of x?
(1) d=4 (2) e=8 CONCEPT: TO round off a number at any place we only need to know the next place digit i.e. to round off tenth we need Hundredth, To round off Hundredth we need only Thousandth digit and so on...
If next place is 0 to 4 then the digit to be rounded off remains same If next place is 5 to 9 then the digit to be rounded offis rounded up i.e. next digitQuestion : 3.1de rounded to the nearest tenth=?i.e. we only need to know the value of d Statement 1: d=4SUFFICIENT Statement 2: e=8NOT SUFFICIENT Answer: option A
_________________
Prosper!!! GMATinsight Bhoopendra Singh and Dr.Sushma Jha email: info@GMATinsight.com I Call us : +919999687183 / 9891333772 Online OneonOne Skype based classes and Classroom Coaching in South and West Delhi http://www.GMATinsight.com/testimonials.html
ACCESS FREE GMAT TESTS HERE:22 ONLINE FREE (FULL LENGTH) GMAT CAT (PRACTICE TESTS) LINK COLLECTION



Current Student
Joined: 12 Aug 2015
Posts: 2630

Re: In the decimal 3.1de, d and e each represent a digit. If x
[#permalink]
Show Tags
18 Nov 2016, 23:26
Nice Question Here decimal=3.1de rounding x to nearest tenths we will get either => 3.1 for d=0,1,2,3,4 OR 3.2 fro d=5,6,7,8,9 Hence we need the value of d here Statement 1 => sufficient => x=3.1 Statement 2 => no clue of d => not sufficient Hence A
_________________
MBA Financing: INDIAN PUBLIC BANKS vs PRODIGY FINANCE! Getting into HOLLYWOOD with an MBA! The MOST AFFORDABLE MBA programs!STONECOLD's BRUTAL Mock Tests for GMATQuant(700+)AVERAGE GRE Scores At The Top Business Schools!



NonHuman User
Joined: 09 Sep 2013
Posts: 9098

Re: In the decimal 3.1de, d and e each represent a digit. If x
[#permalink]
Show Tags
07 Dec 2017, 03:53
Hello from the GMAT Club BumpBot! Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up  doing my job. I think you may find it valuable (esp those replies with Kudos). Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
GMAT Books  GMAT Club Tests  Best Prices on GMAT Courses  GMAT Mobile App  Math Resources  Verbal Resources




Re: In the decimal 3.1de, d and e each represent a digit. If x &nbs
[#permalink]
07 Dec 2017, 03:53






