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

It is currently 18 Jul 2018, 19:23

Close

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
Your Progress

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.

Close

Request Expert Reply

Confirm Cancel

In two alloys, copper and zinc are in the ratios of 4:1 and 1:3.

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
1 KUDOS received
Intern
Intern
User avatar
B
Joined: 06 Jun 2018
Posts: 13
WE: Engineering (Energy and Utilities)
In two alloys, copper and zinc are in the ratios of 4:1 and 1:3. [#permalink]

Show Tags

New post 06 Jul 2018, 22:43
1
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 100% (02:26) wrong based on 1 sessions

HideShow timer Statistics

In two alloys, copper and zinc are in the ratios of 4:1 and 1:3. 10kg of 1st alloy and 16kg of 2nd alloy and some pure copper are melted together. An alloy was obtained in which the ratio of copper to zinc was 3:2. Find the weight of the new alloy.

1) 24
2) 38
3) 40
4) 55
5) 36
BSchool Forum Moderator
User avatar
V
Joined: 26 Feb 2016
Posts: 2941
Location: India
GPA: 3.12
Premium Member
In two alloys, copper and zinc are in the ratios of 4:1 and 1:3. [#permalink]

Show Tags

New post 06 Jul 2018, 23:18
GoonerForever wrote:
In two alloys, copper and zinc are in the ratios of 4:1 and 1:3. 10kg of 1st alloy and 16kg of 2nd alloy and some pure copper are melted together. An alloy was obtained in which the ratio of copper to zinc was 3:2. Find the weight of the new alloy.

1) 24
2) 38
3) 40
4) 55
5) 36


Are your answer options correct?
_________________

You've got what it takes, but it will take everything you've got

Manager
Manager
avatar
B
Joined: 19 Nov 2017
Posts: 90
Location: India
Schools: ISB
GMAT 1: 670 Q49 V32
GPA: 4
CAT Tests
Re: In two alloys, copper and zinc are in the ratios of 4:1 and 1:3. [#permalink]

Show Tags

New post 06 Jul 2018, 23:51
Answer should be 35. Please check your answer choices.

Regards,
V
_________________

Consider giving a Kudos if you like the post

Sky is the limit. 800 is the limit.

~GMAC

BSchool Forum Moderator
User avatar
V
Joined: 26 Feb 2016
Posts: 2941
Location: India
GPA: 3.12
Premium Member
Re: In two alloys, copper and zinc are in the ratios of 4:1 and 1:3. [#permalink]

Show Tags

New post 07 Jul 2018, 00:04
vaibhav1221 wrote:
Answer should be 35. Please check your answer choices.

Regards,
V


I agree vaibhav1221

So, this is how I went about this problem:
If there is 10 kg of the first alloy and the ratio is 4:1, there is 8 kg of copper for 2 kg of zinc
Similarly, for 16 kg of the second alloy and ratio of 1:3, there is 4 kg of copper for 12 kg of zinc
We need a new alloy in which the ratio of copper to zinc is 3:2(3x:2x)

Since we can add pure copper to this mixture and get the new alloy with the 3:2 ratio,
8+4+x/2+12 = 3/2 -> 42 = 2(12+x) -> x = 9

When we add 9 kg of pure copper, the resulting weight of the new alloy will be 10+16+9 = 35kg

GoonerForever - Please check your answer options. We must have 35 kg as an option!
_________________

You've got what it takes, but it will take everything you've got

Re: In two alloys, copper and zinc are in the ratios of 4:1 and 1:3.   [#permalink] 07 Jul 2018, 00:04
Display posts from previous: Sort by

In two alloys, copper and zinc are in the ratios of 4:1 and 1:3.

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

Moderators: chetan2u, KarishmaB, niks18, Bunuel

Events & Promotions

PREV
NEXT


GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

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

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.