GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 13 Oct 2019, 15:42 GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.  A certain bag contains red, blue, and green marbles. What is the ratio

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:

Hide Tags

Intern  Joined: 22 Jan 2016
Posts: 2
A certain bag contains red, blue, and green marbles. What is the ratio  [#permalink]

Show Tags 00:00

Difficulty:   5% (low)

Question Stats: 96% (00:57) correct 4% (01:02) wrong based on 93 sessions

HideShow timer Statistics

A certain bag contains red, blue, and green marbles. What is the ratio of number of green marbles to the number of red marbles in the bag?

(1) The number of blue marbles in the bag is two times the number of green marbles in the bag.
(2) The number of blue marbles in the bag is three times the number of red marbles in the bag.

Can anyone help?
Pls do correct me if I am mistaken with the difficulty.

Originally posted by tudelue on 03 Mar 2016, 09:35.
Last edited by Bunuel on 11 Jun 2019, 03:08, edited 2 times in total.
Renamed the topic.
CEO  S
Joined: 20 Mar 2014
Posts: 2603
Concentration: Finance, Strategy
Schools: Kellogg '18 (M)
GMAT 1: 750 Q49 V44 GPA: 3.7
WE: Engineering (Aerospace and Defense)
Re: A certain bag contains red, blue, and green marbles. What is the ratio  [#permalink]

Show Tags

2
1
tudelue wrote:
A certain bag contains red, blue, and green marbles. What is the ratio of number of green marbles to the number of red marbles in the bag?

(1) The number of blue marbles in the bag is two times the number of green marbles in the bag.
(2) The number of blue marbles in the bag is three times the number of red marbles in the bag.

Can anyone help?
Pls do correct me if I am mistaken with the difficulty.

Please follows posting guidelines (link in my signatures). Do add OA when you start a new question.

As for the question, let B,R,G stand for # of blue, red and green balls respectively.

You are asked for G/R =?

Per statement 1, B=2G , clearly not sufficient. Take 2 cases, R=10, G=10, B=20 ---> G/R=1 but if R=20, G=10, B=20, then G/R=0.5

Per statement 2, B=3R. Again, not sufficient.

Combining, you get, B=3R=2G --> 3R=2G --> G/R=1.5 . Unique value. Hence both statements together are sufficient.

Hope this helps.
Manager  Joined: 15 Feb 2016
Posts: 59
GMAT 1: 710 Q48 V40 Re: A certain bag contains red, blue, and green marbles. What is the ratio  [#permalink]

Show Tags

2
tudelue wrote:
A certain bag contains red, blue, and green marbles. What is the ratio of number of green marbles to the number of red marbles in the bag?

(1) The number of blue marbles in the bag is two times the number of green marbles in the bag.
(2) The number of blue marbles in the bag is three times the number of red marbles in the bag.

Can anyone help?
Pls do correct me if I am mistaken with the difficulty.

It is a very simple question.

To know the ratio between A and B , we have to have some information that relates A and B.

Statement 1 talks about blue and green which does nothing to help with red and green ratio.
Statement 2 does the same by providing information only on relation between blue and red.

Combining these two, we have a relation for red:blue:green For example if there are x green marbles in the bag, there will be 2x blue and 2/3x red marbles.

Hence C
_________________
It is not who I am underneath but what I do that defines me.
CEO  V
Joined: 12 Sep 2015
Posts: 3990
Re: A certain bag contains red, blue, and green marbles. What is the ratio  [#permalink]

Show Tags

Top Contributor
tudelue wrote:
A certain bag contains red, blue, and green marbles. What is the ratio of number of green marbles to the number of red marbles in the bag?

(1) The number of blue marbles in the bag is two times the number of green marbles in the bag.
(2) The number of blue marbles in the bag is three times the number of red marbles in the bag.

Given: A certain bag contains red, blue, and green marbles.
Let R = # number red marbles in the bag
Let B = # number blue marbles in the bag
Let G = # number green marbles in the bag

Target question: What is the value of G/R?

Statement 1: The number of blue marbles in the bag is two times the number of green marbles in the bag.
In other words, B/G = 2/1
Since we don't have any information about the value of R, we cannot answer the target question with certainty.
So, statement 1 is NOT SUFFICIENT

Statement 2: The number of blue marbles in the bag is three times the number of red marbles in the bag.
There are several values of x and y that satisfy statement 2. Here are two:
In other words, B/R = 3/1
Since we don't have any information about the value of G, we cannot answer the target question with certainty.
So, statement 2 is NOT SUFFICIENT

Statements 1 and 2 combined
Statement 1 tells us that B/G = 2/1, which means G/B = 1/2
Statement 2 tells us that B/R = 3/1

From here, we can quickly find the value of G/R if we recognize that (G/B)(B/R) = G/R
Replace each expression with its equivalent value to get: (1/2)(3/1) = G/R
Simplify: 3/2 = G/R
Since we can answer the target question with certainty, the combined statements are SUFFICIENT

Cheers,
Brent
_________________ Re: A certain bag contains red, blue, and green marbles. What is the ratio   [#permalink] 06 Feb 2019, 07:53
Display posts from previous: Sort by

A certain bag contains red, blue, and green marbles. What is the ratio

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne  