GMAT Club Forum - Forums > Data Sufficiency (DS)

Data Sufficiency (DS) | Re: Each of the 45 books on a shelf is written either in English or in Spa

(bumpbot) — Sat, 27 Apr 2024 12:17:10 -0800

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.

Statistics : Posted by bumpbot • on Dec 23, 2015 9:16 pm • Replies 21 • Views 43990

Data Sufficiency (DS) | Is the median of the a + b quiz scores greater than the mean of the

(nisen20) — Sat, 27 Apr 2024 11:40:28 -0800

Quote:

[align=center]
...

Statistics : Posted by nisen20 • on Feb 14, 2024 8:16 am • Replies 7 • Views 1919

Data Sufficiency (DS) | Re: A cafeteria offers seven types of sandwiches, each with a fixed price

(bumpbot) — Sat, 27 Apr 2024 11:07:31 -0800

Statistics : Posted by bumpbot • on Feb 08, 2017 8:51 am • Replies 6 • Views 4742

Data Sufficiency (DS) | The amount of water in a salt water sugar solution is increased by 2/5

(MartyMurray) — Sat, 27 Apr 2024 11:01:30 -0800

The amount of water in a salt water sugar solution is increased by 2/5. Before the increase, what was the ratio of the weight of water to the weight of thesolution?

Let

W = Orignal Water Weight

S = Sugar Weight

T = Original Total Weight

Information given:

W is increased to 7/5 *W.

S1) Due to the addition of water, the ratio of weight of the sugar in the solution to the weight of the solution decreases from 1/4to 1/5.

This information tells us that the increase in the amount of water in the solution increased the total amount of solution by 1/4.

After all, if

S = 1/4 * T

and

S = 1/5 * (T + 2/5 * W)

then,

1/4 * T = 1/5 * (T + 2/5 * W)

5/4 * T = (T + 2/5 * W)

So,

1/4 * T = 2/5 * W

We could solve that to find the relationship between W andT.

Sufficient.

S2) After the addition of water, the ratio of the weight of water in the solution to the weight of the solutionbecomes 7/10.

Here we have 7/5 * W = 7/10 * (T + 2/5 * W).

We could solve that to find the
...

Statistics : Posted by MartyMurray • on Dec 04, 2021 6:59 pm • Replies 10 • Views 4920

Data Sufficiency (DS) | Re: In the first hour of a bake sale, students sold either cho

(bumpbot) — Sat, 27 Apr 2024 07:52:22 -0800

Statistics : Posted by bumpbot • on Jun 09, 2013 2:04 am • Replies 14 • Views 12951

Data Sufficiency (DS) | Re: What is the value of x?

(bumpbot) — Sat, 27 Apr 2024 07:51:02 -0800

Statistics : Posted by bumpbot • on Jun 01, 2015 2:59 pm • Replies 8 • Views 4693

Data Sufficiency (DS) | Re: If x and y are positive integers, what is the greatest common divisor

(bumpbot) — Sat, 27 Apr 2024 06:13:34 -0800

Statistics : Posted by bumpbot • on Aug 23, 2010 6:27 pm • Replies 31 • Views 38090

Data Sufficiency (DS) | Re: Jim traveled from X to Y, and arrived at Z. If the average speed for

(sayan640) — Sat, 27 Apr 2024 06:02:20 -0800

Nidzo , Check the highlighted portion. I think you made a mistake there. Distance / speed = time...should be (a+b / 60)

Nidzo wrote:

poojaarora1818 wrote:

Jim traveled from X to Y, and arrived at Z. If the average speed for the whole trip was 60 miles per hour, what is the average speed for the journey from Y to Z?

(1) The average speed for the trip from X to Y is 55 miles per hour.
(2) It took Jim 0.5 hours from Y to Z.

IMO Option A is the correct one because Average speed is Total Distance/Total time and if the total average speed of the whole trip is 60 miles per hour. According to statement 1, the average speed for the trip from X to Y is 55 miles per hour. So, the average speed for the trip from Y to Z would be 60-55 = 5.

Maybe, optionA

poojaarora1818 be careful here. Without knowing anything about the distances one won't be able to solve this question. Just to demonstrate it quickly, I will focus on just statement (1).

From the question stem we know that the average speed for the
...

Statistics : Posted by sayan640 • on Apr 09, 2024 8:30 am • Replies 4 • Views 516

Data Sufficiency (DS) | Driving at their respective constant speeds along the same route,

(nisen20) — Sat, 27 Apr 2024 04:33:37 -0800

ashdank94 wrote:

(r+24)t = r(t+1) (since V was driving an hour more ahead of A)
I think what I did wrong was substitute 4 into t, so I got r = 96.

i'm not sure what r or t represents here, but 96 might be resulted from "names' gender issue" that is not a issue for native speakers but could be a big one for non-native speakers.

Quote:

(1) Alfred overtook Violet 4 hours after she passed the landmark.

Alfred is a male name, and Violet is female.

$4V = 3(V + 24)$
$V = 72$

if you misunderstood that pronoun—she—belongs to Alfred, you would get $5V = 4(V + 24)$ and $V = 96$.

Statistics : Posted by nisen20 • on Dec 03, 2023 1:03 pm • Replies 8 • Views 2042

Data Sufficiency (DS) | Re: For a class of 50 students, the table above reports the number of stud

(Bunuel) — Sat, 27 Apr 2024 02:02:30 -0800

1616 wrote:

For a class of 50 students, the table above reports the number of students who expected to receive an A, a B, or a C or below as well as the actual number of students who received each grade. How many students who expected to receive a C or below received a grade of C or below?

(1) Of the students who expected to receive an A or a B, 80% actually did receive an A or a B.

(2) Of the students who expected to receive a B, 6 students actually received a C or below.

What was the point of giving actual grade in thetable?

The actual grades help to calculate how many students who expected to receive a C or below actually received a grade of C or below. Check the red parts below:

From (1), since 80% of students expecting an A or B actually received an A or B, then the remaining 20% received a C or below. Thus, 0.2(25 + 15) = 8 students, expecting an A or B, received a C or below. Since[color=#e74c3c] 14 students
...

Statistics : Posted by Bunuel • on Feb 12, 2020 5:50 pm • Replies 5 • Views 4738

Data Sufficiency (DS) | Re: Of 300 members in an organization, each German

(Bunuel) — Sat, 27 Apr 2024 01:49:19 -0800

1616 wrote:

Hello Bunuel.

Can you please help me in decoding this line --> "each German speaker also speaks English"
Thanks in advance

The line 'each German speaker also speaks English' means that anyone in the organization who speaks German is also able to speak English. Essentially, it means that in the diagram, the German circle is inside the English circle. Note, however, that this does not necessarily mean that all who speak English also speak German.

Statistics : Posted by Bunuel • on May 17, 2017 8:13 pm • Replies 3 • Views 2716

Data Sufficiency (DS) | Re: The table shows the sales forecast from January to June of last year

(nisen20) — Sat, 27 Apr 2024 01:41:01 -0800

Quote:

From January through June of last year, there was a constant, linear relationship between the forecast and actual number of units of Product Z sold.

i think this is what linear relationship between the forecast and actual means.

Statistics : Posted by nisen20 • on Feb 07, 2024 2:14 am • Replies 12 • Views 2279

Data Sufficiency (DS) | Re: (|x| - 1)/(x - 1) =?

(bumpbot) — Fri, 26 Apr 2024 22:51:15 -0800

Statistics : Posted by bumpbot • on Jan 14, 2016 6:36 am • Replies 12 • Views 10632

Data Sufficiency (DS) | Re: If x is a positive integer, what is the remainder when x is divided by

(bumpbot) — Fri, 26 Apr 2024 21:46:22 -0800

Statistics : Posted by bumpbot • on Oct 12, 2017 3:29 pm • Replies 11 • Views 12783

Data Sufficiency (DS) | Re: What is the remainder when m is divided by 3? (1) The remainder when m

(bumpbot) — Fri, 26 Apr 2024 21:34:13 -0800

Statistics : Posted by bumpbot • on Jul 15, 2019 7:37 am • Replies 4 • Views 4316

Data Sufficiency (DS) | Re: What is the average (arithmetic mean) of x and y?

(bumpbot) — Fri, 26 Apr 2024 11:01:04 -0800

Statistics : Posted by bumpbot • on Dec 24, 2013 10:42 am • Replies 7 • Views 38632

Data Sufficiency (DS) | Re: For integers a, b, c and d, if the value of ab/cd = 1, c > a?

(Bunuel) — Fri, 26 Apr 2024 10:48:29 -0800

devashish2407 wrote:

Bunuel wrote:

devashish2407 wrote:

For integers a, b, c and d, if the value of$\frac{ab}{cd} =1$ , is c > a?

(1) bd = 1
(2) b + d =3

Are you sure you copied the question correctly? bd = 1 and b + d = 3 do not have an integer solution for b and d.

Also, this type of algebraic questions is no longer a part of the syllabus of GMAT Focus. So, you can ignore this questionaltogether.

Oh yes I checked again, I copied the correct question.

Also, where I can find the updated syllabus? I just want to know what kind of algebric questions I need topractice.

Checkthis:

GMAT Syllabus for FocusEdition

This Question is Locked Due to Poor Quality

Hi there,

The question you've reached has been archived due to not meeting our community quality standards. No more replies are possible here.

Looking for better-quality questions? Check out the 'Similar Questions' block below

for a list of similar but high-quality questions.

Want to join other relevant Problem Solving discussions? Visit our Data Sufficiency (DS) Forum

for the most recent and top-quality discussions.

Thank you for understanding, and happy exploring!

...

Statistics : Posted by Bunuel • on Apr 26, 2024 5:00 pm • Replies 6 • Views 188

Data Sufficiency (DS) | Re: A bibliophile has a big collection of both fiction and non-fiction

(KarishmaB) — Fri, 26 Apr 2024 09:49:53 -0800

GianKR wrote:

KarishmaB wrote:

GianKR wrote:

A bibliophile has a big collection of both fiction and non-fiction books in which non-fiction account for 40% of his books. On his birthday, all his friends gift him fiction books such that non-fiction now account for only 25% of his collection. By what percent has the number of fiction books increased in his collection?

A) 30%
B) 50%
C) 60%
D) 80%
E)100%

Think of it as mixtures.
I am mixing two groups. One has 40% non fiction books. (His current collection). The other has 0% non fiction books (gifts).
The overall mixture becomes 25% non fictionbooks.

$\frac{w1}{w2} =\frac{ (A2 - Avg)}{(Avg -A1)} =\frac{ (0 -25)}{(25-40)} =\frac{5}{3}$

So if he had 5 books total originally (3 fiction and 2 non fiction), his friends gifted him 3 fiction books.
So number of fiction books have increased by 100% (3 has become 6).

Answer(E)

GianKR - It is just a matter of practice. We are so used to using algebra that we are unable to think beyond it. The learners who get used to weighted averages cannot see
...

Statistics : Posted by KarishmaB • on Apr 24, 2024 9:58 pm • Replies 5 • Views 255

Data Sufficiency (DS) | Re: If x and y are positive integers, what is the value of x ?

(bumpbot) — Fri, 26 Apr 2024 06:17:29 -0800

Statistics : Posted by bumpbot • on Dec 17, 2017 8:42 am • Replies 10 • Views 2938

Data Sufficiency (DS) | Re: A certain medical insurance company sold two types of policies

(Nidzo) — Fri, 26 Apr 2024 05:48:49 -0800

(1) The revenue from individual policies was 10% of the totalrevenue.

$\frac{1}{10} x =257500$

$ x =25750$ which means that the family policies earned a totalof $231750$ .

However, without knowing how many policies were sold it's impossible to solve how much a family policycosts.

INSUFFICIENT

(2) The company sold three times as many family policies as they did individualpolicies.

Let family polices= $f$ and individual polcies= $i$.

$ f =3i$

Without further information one cannot solve for the cost of a familypolicy.

INSUFFICIENT

(1+2)

Together, we know that the the individual policies generated$25750$ revenue, that each policycosts $250$ and that 3 times as many family policies were sold than individual policies. We also know that the family policiesgenerated $231750$ ofrevenue.

Number of Individual PoliciesSold: $\frac{25750}{250} =103$ . This meansthat $309$ family policies weresold.

Cost of FamilyPolicies: [m]\frac{231750}{309}
...

Statistics : Posted by Nidzo • on Apr 26, 2024 8:30 am • Replies 1 • Views 154

Data Sufficiency (DS) | Re: If $ represents a digit in the 7-digit number 3,62$,215, what is the

(bumpbot) — Fri, 26 Apr 2024 03:23:49 -0800

Statistics : Posted by bumpbot • on Dec 11, 2014 2:08 pm • Replies 6 • Views 10503

Data Sufficiency (DS) | Starting in 1991, the budget deficit of a certain country was expected

(GMATinsight) — Fri, 26 Apr 2024 02:57:39 -0800

Bunuel wrote:

Starting in 1991, the budget deficit of a certain country was expected to double every year for the next 10 years. At that rate of increase, what will the deficit be at the end of the 10-year period?

(1) The budget deficit of the country in 1991 was $300,000.

(2) The projected increase in the deficit from 1994 to 1995 is$2,400,000.

Question: Dificit at the end of 10 years =?

We already know the rate of growth of Deficit so if we know about the value of deficit in any year then backwards and forward calculation can bedone

Statement1 : The budget deficit of the country in 1991 was$300,000.
SUFFICIENT

Statement2 : The projected increase in the deficit from 1994 to 1995 is$2,400,000.
SUFFICIENT

Answer: OptionD
---
[spoiler=]GMATinsight (Where 80% of students get645+)- Book your FREE trialsession
Providing Focused GMAT Prep (Online and Offline) for GMAT Focus along with 100% successful Admissions counselling
http://www.GMATinsight.com http://www.AdmitSure.com

GMAT Club Forum - Forums > Data Sufficiency (DS)

Data Sufficiency (DS) | Re: Each of the 45 books on a shelf is written either in English or in Spa

Data Sufficiency (DS) | Is the median of the a + b quiz scores greater than the mean of the

Data Sufficiency (DS) | Re: A cafeteria offers seven types of sandwiches, each with a fixed price

Data Sufficiency (DS) | The amount of water in a salt water sugar solution is increased by 2/5

Data Sufficiency (DS) | Re: In the first hour of a bake sale, students sold either cho

Data Sufficiency (DS) | Re: What is the value of x?

Data Sufficiency (DS) | Re: If x and y are positive integers, what is the greatest common divisor

Data Sufficiency (DS) | Re: Jim traveled from X to Y, and arrived at Z. If the average speed for

Data Sufficiency (DS) | Driving at their respective constant speeds along the same route,

Data Sufficiency (DS) | Re: For a class of 50 students, the table above reports the number of stud

Data Sufficiency (DS) | Re: Of 300 members in an organization, each German

Data Sufficiency (DS) | Re: ­The table shows the sales forecast from January to June of last year

Data Sufficiency (DS) | Re: (|x| - 1)/(x - 1) =?

Data Sufficiency (DS) | Re: If x is a positive integer, what is the remainder when x is divided by

Data Sufficiency (DS) | Re: What is the remainder when m is divided by 3? (1) The remainder when m

Data Sufficiency (DS) | Re: What is the average (arithmetic mean) of x and y?

Data Sufficiency (DS) | Re: ­For integers a, b, c and d, if the value of ab/cd = 1, c > a?

Data Sufficiency (DS) | Re: A bibliophile has a big collection of both fiction and non-fiction

Data Sufficiency (DS) | Re: If x and y are positive integers, what is the value of x ?

Data Sufficiency (DS) | Re: A certain medical insurance company sold two types of policies

Data Sufficiency (DS) | Re: If $ represents a digit in the 7-digit number 3,62$,215, what is the

Data Sufficiency (DS) | Starting in 1991, the budget deficit of a certain country was expected

Data Sufficiency (DS) | Re: The table shows the sales forecast from January to June of last year

Data Sufficiency (DS) | Re: For integers a, b, c and d, if the value of ab/cd = 1, c > a?