Author 
Message 
TAGS:

Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 59587

x bags of marbles are to be created, each consisting of y red marbles,
[#permalink]
Show Tags
15 Oct 2019, 21:14
Question Stats:
71% (01:42) correct 29% (02:04) wrong based on 77 sessions
HideShow timer Statistics
Competition Mode Question x bags of marbles are to be created, each consisting of y red marbles, z blue marbles, and nothing else. If the marbles are to be drawn from a total of 84 red marbles and 30 blue marbles and all marbles must be placed in one of the bags, what is the maximum number of bags that can be created? (A) 3 (B) 4 (C) 5 (D) 6 (E) 7
Official Answer and Stats are available only to registered users. Register/ Login.
_________________



VP
Joined: 20 Jul 2017
Posts: 1139
Location: India
Concentration: Entrepreneurship, Marketing
WE: Education (Education)

Re: x bags of marbles are to be created, each consisting of y red marbles,
[#permalink]
Show Tags
15 Oct 2019, 21:31
Maximum number of bags that can be created = HCF of 84 & 30 = 6
IMO Option D



Director
Joined: 18 May 2019
Posts: 527

Re: x bags of marbles are to be created, each consisting of y red marbles,
[#permalink]
Show Tags
15 Oct 2019, 21:35
We are to fill x bags consisting each of y red marbles and z blue marbles, given a total of 84 red marbles and a total of 30 blue marbles.
This can be determined by computing the HCF of 84 and 30, and that would be the total number of bags, x.
Factors of 30 {1,2,3,5,6,10,15,30} Factors of 84 {1,2,3,4,6,7,12,14,21,28,42,81} Hence HCF is 6. So there will be total of 6 bags consisting of 14 red marbles and 5 blue marbles.
The answer is D in my view.
Posted from my mobile device



Manager
Joined: 05 Aug 2018
Posts: 72
Location: Thailand
Concentration: Finance, Entrepreneurship
GPA: 3.68
WE: Business Development (Energy and Utilities)

Re: x bags of marbles are to be created, each consisting of y red marbles,
[#permalink]
Show Tags
15 Oct 2019, 22:25
x bags of marbles are to be created, each consisting of y red marbles, z blue marbles, and nothing else. If the marbles are to be drawn from a total of 84 red marbles and 30 blue marbles and all marbles must be placed in one of the bags, what is the maximum number of bags that can be created?
Finding maximum common divisor between 84 red marbles and 30 blue marbles
84 = 6* 14 30 = 6 * 5
Therefore, maximum number of bags = 6



Senior Manager
Joined: 07 Mar 2019
Posts: 434
Location: India
WE: Sales (Energy and Utilities)

Re: x bags of marbles are to be created, each consisting of y red marbles,
[#permalink]
Show Tags
15 Oct 2019, 22:45
x bags of marbles are to be created, each consisting of y red marbles, z blue marbles, and nothing else. If the marbles are to be drawn from a total of 84 red marbles and 30 blue marbles and all marbles must be placed in one of the bags, what is the maximum number of bags that can be created? (A) 3 (B) 4 (C) 5 (D) 6 (E) 7 Since there would be equal number of red marbles in each bag and equal number of blue ones, the number of marbles, an integer, of each color from a total of 84 red marbles and 30 blue marbles must be minimum and have a common factor. Now, 84:30 = 14:5 Beyond 14 and 5 values are not possible since number of marbles would be an integer. Thus, 6 is the maximum common factor for both 14 and 5. This means that each of the 6 bags must have 14 red marbles and 5 blue marbles. Answer D.
_________________
Ephemeral Epiphany..!
GMATPREP1 590(Q48,V23) March 6, 2019 GMATPREP2 610(Q44,V29) June 10, 2019 GMATPREPSoft1 680(Q48,V35) June 26, 2019



Senior Manager
Joined: 22 Feb 2018
Posts: 312

Re: x bags of marbles are to be created, each consisting of y red marbles,
[#permalink]
Show Tags
15 Oct 2019, 23:00
Imo. D
Total 84 red and 30 blue marbles (total=114) are available.
Maximum # of bags to be created (x to be determine), each bag contain y red and z blue marbles and all 114 shall be consumed to create bags.
The quickest way to solve the question by working from answer choices. The largest no. is 7, so let's divide 84 red marbles and 30 blue marbles in such a way that no marble shall be left. 84/7 = 12 and 30/7 (not divisible by 7), hence two marbles left behind. So, 7 is incorrect Let's try, 6, 84 and 30, both numbers are divisible by 6. So, we can form 6 bags, each containing 14 red and 5 blue marbles. Correct.
(A) 3 (B) 4 (C) 5 (D) 6 (E) 7



Senior Manager
Joined: 25 Jul 2018
Posts: 383

Re: x bags of marbles are to be created, each consisting of y red marbles,
[#permalink]
Show Tags
16 Oct 2019, 02:45
Each bag consists of y red and z blue marbles.
84 red marbles and 30 blue marbles —> there are equal amounts of red and blue marbles in each bag.
We need to find the Greatest Common Divisor of this two numbers: —>84= \(2^{2}*3*7\) 30= 2*3*5 —> GCD(84,30)=6
There are 14 red and 5 blue marbles in each bag. —> The maximum number of bags is 6 The answer is D
Posted from my mobile device



GMAT Club Legend
Joined: 18 Aug 2017
Posts: 5428
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)

Re: x bags of marbles are to be created, each consisting of y red marbles,
[#permalink]
Show Tags
16 Oct 2019, 02:53
since we need to determiner max no of bags , solve seeing answer options option E ; 7 wont be possible since 30 is not divisible by 7 and each bag has to contain equal of red and blue option D ; 6 bags possible i.e each bag with 5 of red and 12 of blue marbles IMO D
x bags of marbles are to be created, each consisting of y red marbles, z blue marbles, and nothing else. If the marbles are to be drawn from a total of 84 red marbles and 30 blue marbles and all marbles must be placed in one of the bags, what is the maximum number of bags that can be created?
(A) 3 (B) 4 (C) 5 (D) 6 (E) 7



Director
Joined: 24 Nov 2016
Posts: 927
Location: United States

Re: x bags of marbles are to be created, each consisting of y red marbles,
[#permalink]
Show Tags
16 Oct 2019, 03:11
Quote: x bags of marbles are to be created, each consisting of y red marbles, z blue marbles, and nothing else. If the marbles are to be drawn from a total of 84 red marbles and 30 blue marbles and all marbles must be placed in one of the bags, what is the maximum number of bags that can be created?
(A) 3 (B) 4 (C) 5 (D) 6 (E) 7 \(prime.f(84)=42*2=21*2*2=7*3*2^2\) \(prime.f(30)=15*2=5*3*2\) \(gcf(85,30)=3*2=6\) Answer (D)



Manager
Joined: 17 Jan 2019
Posts: 127

Re: x bags of marbles are to be created, each consisting of y red marbles,
[#permalink]
Show Tags
16 Oct 2019, 06:01
start from the greatest number; 7: 30 can't be divided by 7 therefore no 6: 30 can be divided by 6 which is 5 but and 84 devided by 6 is 14 bingo, there will be 5 blue and 14 red per bag and a total of 6 bags
Therefore, D




Re: x bags of marbles are to be created, each consisting of y red marbles,
[#permalink]
16 Oct 2019, 06:01






