Author 
Message 
TAGS:

Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 62287

If d denotes a decimal, is d>=0.5 ?
[#permalink]
Show Tags
15 Oct 2012, 03:49
Question Stats:
74% (01:02) correct 26% (01:09) wrong based on 1992 sessions
HideShow timer Statistics
If d denotes a decimal, is \(d\geq{0.5}\) ? (1) When d is rounded to the nearest tenth, the result is 0.5. (2) When d is rounded to the nearest integer, the result is 1. Practice Questions Question: 63 Page: 280 Difficulty: 600
Official Answer and Stats are available only to registered users. Register/ Login.
_________________




Math Expert
Joined: 02 Sep 2009
Posts: 62287

Re: If d denotes a decimal, is d>= ?
[#permalink]
Show Tags
15 Oct 2012, 03:49
SOLUTIONIf d denotes a decimal, is \(d\geq{0.5}\) ?(1) When d is rounded to the nearest tenth, the result is 0.5. This statement implies that \(0.45\leq{d}<0.55\). Not sufficient. (2) When d is rounded to the nearest integer, the result is 1. d cannot be less than 0.5 because in this case 1 won't be the nearest integer. Sufficient. Answer: B.
_________________




Senior Manager
Joined: 24 Aug 2009
Posts: 432
Schools: Harvard, Columbia, Stern, Booth, LSB,

Re: If d denotes a decimal, is d>= ?
[#permalink]
Show Tags
15 Oct 2012, 04:24
1) d can be any number between 0.45 to .54  >Insufficient 2) d can be any number greater than or equal to 0.5>Sufficient Answer B




Board of Directors
Joined: 01 Sep 2010
Posts: 3437

Re: If d denotes a decimal, is d>=0.5 ?
[#permalink]
Show Tags
16 Oct 2012, 01:38
These one are always tricky for me We have to know id d is < = or >= 0,5 1) if the number is 0,45 to 0,54 we have the decimal that cuold be 4 or 5 (0,4 or 0,5) 2) if the numbe must be 1 the number ranging from 0,5 to 0,9 but always the decimal will be >= 0,5 B is the answer
_________________



Manager
Joined: 21 Sep 2012
Posts: 188

Re: If d denotes a decimal, is d>=0.5 ?
[#permalink]
Show Tags
Updated on: 16 Oct 2012, 19:03
so statement 1 (1) When d is rounded to the nearest tenth, the result is 0.5.
so if we pick d=0.48 then in this case the answer to is d>=0.5 is NO
but if we pick d=0.53 then in this case it is YES
2 situations YES / NO ambiguity hence insufficient
When d is rounded to the nearest integer, the result is 1.
so for example if d=0.2 then the decimal would be rounded to nearest integer which is 0
but we have been given that it is rounded to 1 so the range is 0.5 to 1.4 in all of those cases it is rounded to 1 hence B is sufficient
Answer is B
Originally posted by nelz007 on 16 Oct 2012, 05:14.
Last edited by nelz007 on 16 Oct 2012, 19:03, edited 1 time in total.



Director
Status: Done with formalities.. and back..
Joined: 15 Sep 2012
Posts: 552
Location: India
Concentration: Strategy, General Management
Schools: Olin  Wash U  Class of 2015
WE: Information Technology (Computer Software)

Re: If d denotes a decimal, is d>=0.5 ?
[#permalink]
Show Tags
16 Oct 2012, 05:25
Statement 1: round(d,0.1) = 0.5 => 0.45<=d<=0.54 Not suff as d can have values less than 0.5 as well as greater than 0.5 Statement 2: round(d,1) =1 => 0.5 <=d<=1.49 for any value of d here, it is sufficient to answer. Ans B Bunuel wrote: The Official Guide for GMAT® Review, 13th Edition  Quantitative Questions ProjectIf d denotes a decimal, is \(d\geq{0.5}\) ? (1) When d is rounded to the nearest tenth, the result is 0.5. (2) When d is rounded to the nearest integer, the result is 1. Practice Questions Question: 63 Page: 280 Difficulty: 600 GMAT Club is introducing a new project: The Official Guide for GMAT® Review, 13th Edition  Quantitative Questions ProjectEach week we'll be posting several questions from The Official Guide for GMAT® Review, 13th Edition and then after couple of days we'll provide Official Answer (OA) to them along with a solution. 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!



Senior Manager
Joined: 06 Aug 2011
Posts: 316

Re: If d denotes a decimal, is d>=0.5 ?
[#permalink]
Show Tags
16 Oct 2012, 11:16
Its B.. was confused .49 wud be included in option or not...then i thought no..because .51 to1.49 wud b nearest integer 1..
_________________
Bole So Nehal.. Sat Siri Akal.. Waheguru ji help me to get 700+ score !



Target Test Prep Representative
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 9874
Location: United States (CA)

Re: If d denotes a decimal, is d>=0.5 ?
[#permalink]
Show Tags
14 May 2016, 06:50
Bunuel wrote: If d denotes a decimal, is \(d\geq{0.5}\) ?
(1) When d is rounded to the nearest tenth, the result is 0.5. (2) When d is rounded to the nearest integer, the result is 1. Solution: We are given that d is a decimal, and we need to determine whether d is greater than or equal to 0.5. Statement One Alone:When d is rounded to the nearest tenth, the result is 0.5. Using the information in statement one, we can get a multitude of values for d. For example, d can be 0.51, and 0.51 is greater than or equal to 0.5.In another case, d can be 0.49, but 0.49 is not greater than or equal to 0.5.Statement one is not sufficient to answer the question. We can eliminate answer choices A and D. Statement Two Alone:When d is rounded to the nearest integer, the result is 1. In order for d to be rounded to 1 (when rounded to the nearest integer), the value of d must be at least 0.5. Statement two is sufficient to answer the question. The answer is B.
_________________
5star rated online GMAT quant self study course See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews If you find one of my posts helpful, please take a moment to click on the "Kudos" button.



GMAT Club Legend
Joined: 11 Sep 2015
Posts: 4540
Location: Canada

Re: If d denotes a decimal, is d>=0.5 ?
[#permalink]
Show Tags
15 Mar 2018, 06:12
Bunuel wrote: If d denotes a decimal, is d ≥ 0.5?
(1) When d is rounded to the nearest tenth, the result is 0.5. (2) When d is rounded to the nearest integer, the result is 1.
Target question: Is d ≥ 0.5? Statement 1: When d is rounded to the nearest tenth, the result is 0.5. There are several values of d that satisfy statement 1. Here are two: Case a: d = 0.51 (we get 0.5 when 0.51 is rounded to the nearest tenth). In this case, the answer to the target question is YES, it IS the case that d ≥ 0.5Case b: d = 0.49 (we get 0.5 when 0.49 is rounded to the nearest tenth). In this case, the answer to the target question is NO, it is NOT the case that d ≥ 0.5Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT Statement 2: When d is rounded to the nearest integer, the result is 1If we get 1 when d is rounded to the nearest integer, then we know that 0.5 ≤ d < 1.5[/color] So, it MUST be the case that d ≥ 0.5Since we can answer the target question with certainty, statement 2 is SUFFICIENT Answer: B Cheers, Brent
_________________
Test confidently with gmatprepnow.com



Intern
Joined: 06 Sep 2018
Posts: 36
GMAT 1: 760 Q50 V44 GMAT 2: 740 Q48 V44

If d denotes a decimal, is d>=0.5 ?
[#permalink]
Show Tags
12 Sep 2018, 08:05
When the question says "If d denotes a decimal", can that mean that d is for instance 6.1? Isn't 6.1 a decimal? Or is it only 0.XXXXXXX ? I am confused as to the definition of "a decimal". Thank you!



Math Expert
Joined: 02 Sep 2009
Posts: 62287

Re: If d denotes a decimal, is d>=0.5 ?
[#permalink]
Show Tags
12 Sep 2018, 20:54
gmat800live wrote: When the question says "If d denotes a decimal", can that mean that d is for instance 6.1? Isn't 6.1 a decimal? Or is it only 0.XXXXXXX ? I am confused as to the definition of "a decimal". Thank you! A decimal is a fraction that is written in the form of a dot followed by one or more numbers which represent tenths, hundredths, and so on. For example, 0.1, 5.1, ... So, to answer your question, yes, 6.1 is also a decimal.
_________________



Intern
Joined: 12 Jul 2018
Posts: 1
WE: Information Technology (Consulting)

Re: If d denotes a decimal, is d>=0.5 ?
[#permalink]
Show Tags
06 Nov 2018, 07:18
Bunuel wrote: If d denotes a decimal, is \(d\geq{0.5}\) ? (1) When d is rounded to the nearest tenth, the result is 0.5. (2) When d is rounded to the nearest integer, the result is 1. Practice Questions Question: 63 Page: 280 Difficulty: 600 So 0.499 rounded to integer can't be 1 is it? Rounding off a number means, only that number not the number after it?



Manager
Joined: 10 Dec 2019
Posts: 53

Re: If d denotes a decimal, is d>=0.5 ?
[#permalink]
Show Tags
08 Feb 2020, 10:21
Bunuel wrote: SOLUTION
If d denotes a decimal, is \(d\geq{0.5}\) ?
(1) When d is rounded to the nearest tenth, the result is 0.5. This statement implies that \(0.45\leq{d}<0.55\). Not sufficient.
(2) When d is rounded to the nearest integer, the result is 1. d cannot be less than 0.5 because in this case 1 won't be the nearest integer. Sufficient.
Answer: B. Hi BunuelI am confused with respect to Statement 1, if result is 0.5 when d is rounded to nearest tenth range would be 0.45 to 0.49 (instead of 0.54) Then ST 1 would mean definite No. Can you please help me out?



Math Expert
Joined: 02 Sep 2009
Posts: 62287

Re: If d denotes a decimal, is d>=0.5 ?
[#permalink]
Show Tags
08 Feb 2020, 10:28
Anurag06 wrote: Bunuel wrote: SOLUTION
If d denotes a decimal, is \(d\geq{0.5}\) ?
(1) When d is rounded to the nearest tenth, the result is 0.5. This statement implies that \(0.45\leq{d}<0.55\). Not sufficient.
(2) When d is rounded to the nearest integer, the result is 1. d cannot be less than 0.5 because in this case 1 won't be the nearest integer. Sufficient.
Answer: B. Hi BunuelI am confused with respect to Statement 1, if result is 0.5 when d is rounded to nearest tenth range would be 0.45 to 0.49 (instead of 0.54) Then ST 1 would mean definite No. Can you please help me out? Let me ask you: what is, say, 0.53 rounded to the nearest tenth?
_________________



Manager
Joined: 10 Dec 2019
Posts: 53

Re: If d denotes a decimal, is d>=0.5 ?
[#permalink]
Show Tags
08 Feb 2020, 10:32
Bunuel wrote: Anurag06 wrote: Bunuel wrote: SOLUTION
If d denotes a decimal, is \(d\geq{0.5}\) ?
(1) When d is rounded to the nearest tenth, the result is 0.5. This statement implies that \(0.45\leq{d}<0.55\). Not sufficient.
(2) When d is rounded to the nearest integer, the result is 1. d cannot be less than 0.5 because in this case 1 won't be the nearest integer. Sufficient.
Answer: B. Hi BunuelI am confused with respect to Statement 1, if result is 0.5 when d is rounded to nearest tenth range would be 0.45 to 0.49 (instead of 0.54) Then ST 1 would mean definite No. Can you please help me out? Let me ask you: what is, say, 0.53 rounded to the nearest tenth? Oh I got it. Thank you Bunuel. Kudos!



SVP
Joined: 23 Feb 2015
Posts: 1641

If d denotes a decimal, is d>=0.5 ?
[#permalink]
Show Tags
21 Feb 2020, 11:11
Bunuel wrote: If d denotes a decimal, is \(d\geq{0.5}\) ?
(1) When d is rounded to the nearest tenth, the result is 0.5. (2) When d is rounded to the nearest integer, the result is 1.
Statement 2: If \(d≤0.5\), there is no chance to be the nearest integer 1. The answer is Yes> Sufficient. Statement 1: We should not try for finding Yes answer here because we've an automatic Yes in the statement 2 (as statements don't contradict each other). So, if d=0.45, then No. So, it gives YES and NO answer at a time.>Insufficient. The correct choice is



SVP
Joined: 23 Feb 2015
Posts: 1641

Re: If d denotes a decimal, is d>=0.5 ?
[#permalink]
Show Tags
21 Feb 2020, 11:42
Bunuel wrote: SOLUTION
If d denotes a decimal, is \(d\geq{0.5}\) ?
(1) When d is rounded to the nearest tenth, the result is 0.5. This statement implies that \(0.45\leq{d}<0.55\). Not sufficient.
(2) When d is rounded to the nearest integer, the result is 1. d cannot be less than 0.5 because in this case 1 won't be the nearest integer. Sufficient.
Answer: B. BunuelWhat if d=0.5? If d=0.5 then the nearest integer is 1 or 0. So, should not we consider d≤0.5 in the highlighted part? Thanks_




Re: If d denotes a decimal, is d>=0.5 ?
[#permalink]
21 Feb 2020, 11:42






