January 17, 2019 January 17, 2019 08:00 AM PST 09:00 AM PST Learn the winning strategy for a high GRE score — what do people who reach a high score do differently? We're going to share insights, tips and strategies from data we've collected from over 50,000 students who used examPAL. January 19, 2019 January 19, 2019 07:00 AM PST 09:00 AM PST Aiming to score 760+? Attend this FREE session to learn how to Define your GMAT Strategy, Create your Study Plan and Master the Core Skills to excel on the GMAT.
Author 
Message 
TAGS:

Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 52182

Question Stats:
66% (01:25) correct 34% (01:24) wrong based on 188 sessions
HideShow timer Statistics



Math Expert
Joined: 02 Sep 2009
Posts: 52182

Re M0923
[#permalink]
Show Tags
15 Sep 2014, 23:40
Official Solution: (1) If the player had won 25 percent of the total games he played, he would have lost 30 more games than he actually did. The player won 25% of his first 20 games and 100% of the remaining games, in order to win 25% of total matches he should have won 25% of the remaining games (instead of 100%, so 75% less). So 75% losses in the remaining games result in 30 more losses: \(0.75*R=30\), where \(R\) is the number of the remaining games. We have only one unknown \(R\), hence we can solve for it and thus we'll have all information needed to get the ratio. Sufficient. (2) The player won 75 percent of the games he played. So, \(0.25*20+1*R=0.75*(20+R)\). The same here: we have only one unknown \(R\), hence we can solve for it and thus we'll have all information needed to get the ratio. Sufficient. Answer: D
_________________
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: 24 Sep 2013
Posts: 8

Re: M0923
[#permalink]
Show Tags
09 Dec 2014, 07:23
Hi Bunuel, Dont you think the question should be re framed as the ratio of the games he won to the number of games he DID NOT WIN. A chess game can also be a draw, I got confused and marked E, since no where do we know how many draws were there ? Bunuel wrote: Official Solution:
(1) If the player had won 25 percent of the total games he played, he would have lost 30 more games than he actually did. The player won 25% of his first 20 games and 100% of the remaining games, in order to win 25% of total matches he should have won 25% of the remaining games (instead of 100%, so 75% less). So 75% losses in the remaining games result in 30 more losses: \(0.75*R=30\), where \(R\) is the number of the remaining games. We have only one unknown \(R\), hence we can solve for it and thus we'll have all information needed to get the ratio. Sufficient. (2) The player won 75 percent of the games he played. So, \(0.25*20+1*R=0.75*(20+R)\). The same here: we have only one unknown \(R\), hence we can solve for it and thus we'll have all information needed to get the ratio. Sufficient.
Answer: D



Intern
Joined: 10 May 2015
Posts: 28

Re: M0923
[#permalink]
Show Tags
12 Aug 2015, 18:36
I think this is a poorquality question and the explanation isn't clear enough, please elaborate.



Math Expert
Joined: 02 Sep 2009
Posts: 52182

Re: M0923
[#permalink]
Show Tags
17 Aug 2015, 02:41



Intern
Joined: 03 May 2015
Posts: 11

Re: M0923
[#permalink]
Show Tags
26 Aug 2015, 03:42
I think this is a highquality question and I don't agree with the explanation. THE QUESTION NEEDS TO CLEARLY MENTION THAT A PLAYER CAN ONLY WIN OR LOSE A GAME AND THAT NO GAME CAN BE DRAWN  NOW THE SOLUTION PROVIDED IS VALID, ELSE THE ANSWER CHOICE IS E ( AS NO. OF DRAWN GAMES IS AN UNKNOWN EVEN AFTER COMBINING BOTH STATEMENTS).



Intern
Joined: 28 Feb 2015
Posts: 17
Location: India
Schools: HBS '18, Stanford '18, Wharton '18, Kellogg '18, Booth PT '19, Sloan '18, CBS '18, Haas '18, Tuck '18, Stern '18, Yale '18, LBS '18, INSEAD Jan '17, Oxford"18, Judge'17, Cambridge MiF"17
GPA: 4
WE: Consulting (Consulting)

Re: M0923
[#permalink]
Show Tags
05 Sep 2015, 20:10
As far as explanation for 2nd option is considered "The player won 75 percent of the games he played", I applied very simple approach as follows: What is the question looking for?  What is the ratio of the number of games he won to the number of the games he lost?  say number of games he won be 'x' and number of games he lost be 'y'  hence, x/(x+y) = 75%  question  what is x/y?  if x/(x+y) = 75/100, (x+y)/x = 100/75  hence 1 + y/x = 4/3 hence y/x = 4/3  1 = 1/3  thus x/y = 3  basically, at step  if x/(x+y) = 75/100, (x+y)/x = 100/75  you can conclude that you can find value of x/y. You need not actually solve it.
Do I make any sense?



Intern
Joined: 22 Jan 2014
Posts: 6

Re: M0923
[#permalink]
Show Tags
12 Sep 2015, 06:09
I think this is a poorquality question and the explanation isn't clear enough, please elaborate. one of the possibilities in a chess match is a draw, this aspect is not counted for in the explanation, why?



Senior Manager
Joined: 12 Aug 2015
Posts: 284
Concentration: General Management, Operations
GMAT 1: 640 Q40 V37 GMAT 2: 650 Q43 V36 GMAT 3: 600 Q47 V27
GPA: 3.3
WE: Management Consulting (Consulting)

Re: M0923
[#permalink]
Show Tags
14 Sep 2015, 21:22
the q needs to be improved to take account of draws. the similar logics applies here as to the questions with triple overlapping sets  when m08183778.html  the stimulus says people like both strawberry and apple but the quesiton does not specifically note that they cannot like raspberry as well. same here. unfair
_________________
KUDO me plenty



Senior Manager
Joined: 12 Aug 2015
Posts: 284
Concentration: General Management, Operations
GMAT 1: 640 Q40 V37 GMAT 2: 650 Q43 V36 GMAT 3: 600 Q47 V27
GPA: 3.3
WE: Management Consulting (Consulting)

Re: M0923
[#permalink]
Show Tags
14 Sep 2015, 21:22
I think this is a poorquality question and I don't agree with the explanation. the q needs to be improved to take account of draws. the similar logics applies here as to the questions with triple overlapping sets  when m08183778.html  the stimulus says people like both strawberry and apple but the quesiton does not specifically note that they cannot like raspberry as well. same here. unfair
_________________
KUDO me plenty



Intern
Joined: 12 Jul 2015
Posts: 6
Location: United States
WE: Engineering (Manufacturing)

Re: M0923
[#permalink]
Show Tags
20 Sep 2015, 15:35
I think this is a poorquality question and the explanation isn't clear enough, please elaborate.



Intern
Joined: 18 Feb 2015
Posts: 2
GMAT Date: 07142015

Re: M0923
[#permalink]
Show Tags
23 Nov 2015, 15:13
I think this is a poorquality question and the explanation isn't clear enough, please elaborate. The question does not take into account any other possibility other than a win and a loss.But there are three possibilities that result from a chess game:Win,Lose,Draw.



Manager
Joined: 09 Jul 2015
Posts: 56

Re: M0923
[#permalink]
Show Tags
26 Nov 2015, 14:02
I think this is a poorquality question and I don't agree with the explanation. This question does not clearly talk about what happens if the game is drawn. The question should have clearly mentioned 'none of the games were a draw'.
_________________
Please kudos if you find this post helpful. I am trying to unlock the tests



Manager
Joined: 11 Oct 2013
Posts: 106
Concentration: Marketing, General Management

Re: M0923
[#permalink]
Show Tags
18 Dec 2015, 07:11
Bunuel wrote: A chess player won 25 percent of the first 20 games he played and all of his remaining games. What is the ratio of the number of games he won to the number of the games he lost?
(1) If the player had won 25 percent of the total games he played, he would have lost 30 more games than he actually did.
(2) The player won 75 percent of the games he played. This is how I went about the question, not sure if its good enough! [Edited: My mistake was that I read all of the remaining games as 'lost' all of the remaining games] Player won 25% of first 20 matches = 5 matches. Let total matches be x. He lost x5 matches. We need to find 5/x5. To find this we need total number of matches. A) If the player had won 25 percent of the total games he played, he would have lost 30 more games than he actually did. games won + games lost = total games x/4 + 5+30 = x. We can solve for x. Sufficient. B) The player won 75 percent of the games he played. Something is wrong with my understanding coz he played atleast 20 matches and won 25%. But for the sake of solving the question, I assumed 0.75x = 5. x can be solved. Sufficient. Answer D
_________________
Its not over..



Math Expert
Joined: 02 Sep 2009
Posts: 52182

Re: M0923
[#permalink]
Show Tags
19 Jan 2016, 09:12



Intern
Joined: 22 Aug 2014
Posts: 41

Re: M0923
[#permalink]
Show Tags
28 Mar 2016, 06:16
davesinger786 wrote: I think this is a poorquality question and the explanation isn't clear enough, please elaborate. I think it is a good question. I agree that explanation can be clearer. Here is my explanation: First analyse the information given in the question. He won =5+x. Win/loss=(5+x)/15. Now explore x from (1) and/or (2) to check data sufficiency. (1) 25% of the total games won=(20+x)/4. So,lost(total)=(20+x)*3/4 From the first 20 games, he lost 15. 30 games more means =15+30=45. So, total lost=45=(20+x)*3/4. Since x can be found from this equation,sufficient (2)Similarly, we can say, (20+x)*3/4=5+x. Sufficient Answer is D.



Manager
Joined: 23 Jun 2009
Posts: 180
Location: Brazil
GMAT 1: 470 Q30 V20 GMAT 2: 620 Q42 V33

Re: M0923
[#permalink]
Show Tags
03 Aug 2016, 05:10
Here is my two cents. I think my approach is for dummies, but without this stepbystep, average test takers cannot absorb most of the creative answers
>> !!!
You do not have the required permissions to view the files attached to this post.



Manager
Joined: 23 Jun 2009
Posts: 180
Location: Brazil
GMAT 1: 470 Q30 V20 GMAT 2: 620 Q42 V33

Re: M0923
[#permalink]
Show Tags
03 Aug 2016, 05:14
rezaulnsu wrote: davesinger786 wrote: I think this is a poorquality question and the explanation isn't clear enough, please elaborate. I think it is a good question. I agree that explanation can be clearer. Here is my explanation: First analyse the information given in the question. He won =5+x. Win/loss=(5+x)/15. Now explore x from (1) and/or (2) to check data sufficiency. (1) 25% of the total games won=(20+x)/4. So,lost(total)=(20+x)*3/4 From the first 20 games, he lost 15. 30 games more means =15+30=45. So, total lost=45=(20+x)*3/4. Since x can be found from this equation,sufficient (2)Similarly, we can say, (20+x)*3/4=5+x. Sufficient Answer is D. I always ask myself whether the moderator, who I am truly fan of, provides a l holistic approach to questions on purpose to stretch our ways to answer questions.



Intern
Joined: 10 Jun 2016
Posts: 12

Re M0923
[#permalink]
Show Tags
06 Jan 2017, 23:19
I think this is a highquality question and I agree with explanation.



Intern
Joined: 11 Nov 2015
Posts: 20

Re: M0923
[#permalink]
Show Tags
09 Apr 2017, 18:27
Number of wins: 25% of 20+ All the rest of the games (T20)===> 5+(T20) Number of Loss: 75% of 20====> 15 Games
A) 75% T = 45 Loss (15+30), so total games, T=60
\(W:L= 45:15=3\)
Sufficient
B) 75%T=5+T20 ===> T=60
Sufficient







Go to page
1 2
Next
[ 27 posts ]



