Last visit was: 03 Dec 2024, 09:20 It is currently 03 Dec 2024, 09:20
Decision Tracker
My Rewards
New comers' posts
New posts
Unanswered

Close

GRE Prep 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 GRE 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.

Go to My Error Log Learn more
Close

Request Expert Reply

Confirm Cancel
PREVIOUS TOPIC
NEXT TOPIC

Certain amount of solution with 20% concentration of salt ...

Tags :
Find Similar Topics  About  Add a Tag

Show Tags
Hide Tags

User avatar
G
motion2020
Retired Moderator
Joined: 19 Nov 2020
Posts: 326
Own Kudos [?]: 373 [7]
Given Kudos: 64
GRE 1: Q160 V152
Send PM
Certain amount of solution with 20% concentration of salt ... [#permalink] New post   29 Jul 2021, 16:01
7
Bookmarks
00:00

Question Stats:

50% (03:24) correct 50% (03:12) wrong based on 22 sessions

Hide Show timer Statistics

Certain amount of a solution with 20% concentration of salt is heated to loose half of its volume. The remaining solution is added by 4 liters of the solution with 30% concentration of salt. Find the amount of evaporated solution in liters, if the final solution has 24% concentration of salt and heating does not change the concentration of salt in a solution.

(A) 9
(B) 8
(C) 7
(D) 6
(E) 5
ShowHide Answer
Official Answer
D
User avatar
D
KarunMendiratta
Retired Moderator
Joined: 16 Apr 2020
Status:Founder & Quant Trainer
Affiliations: Prepster Education
Posts: 1546
Own Kudos [?]: 3238 [4]
Given Kudos: 172
Location: India
WE:Education (Education)
Send PM
Certain amount of solution with 20% concentration of salt ... [#permalink] New post   29 Jul 2021, 21:00
3
1
Bookmarks
motion2020 wrote:
Certain amount of a solution with 20% concentration of salt is heated to loose half of its volume. The remaining solution is added by 4 liters of the solution with 30% concentration of salt. Find the amount of evaporated solution in liters, if the final solution has 24% concentration of salt and heating does not change the concentration of salt in a solution.

(A) 9
(B) 8
(C) 7
(D) 6
(E) 5


Let the initial solution be of \(x\) liters

20% of \(\frac{x}{2}\) + 30% of 4 liters = 24% of (\(\frac{x}{2}\) + 4)
10x + 120 = 12x + 96
2x = 24
x = 12

Amount of evaporated solution is half of \(x\) i.e. 6 liters
Hence, option D
User avatar
S
aishumurali
Manager
Manager
Joined: 23 May 2021
Posts: 146
Own Kudos [?]: 46 [0]
Given Kudos: 23
Send PM
Re: Certain amount of solution with 20% concentration of salt ... [#permalink] New post   18 Aug 2021, 18:29
Are there more sums like this to practise?
User avatar
D
KarunMendiratta
Retired Moderator
Joined: 16 Apr 2020
Status:Founder & Quant Trainer
Affiliations: Prepster Education
Posts: 1546
Own Kudos [?]: 3238 [1]
Given Kudos: 172
Location: India
WE:Education (Education)
Send PM
Re: Certain amount of solution with 20% concentration of salt ... [#permalink] New post   18 Aug 2021, 21:54
1
aishumurali wrote:
Are there more sums like this to practise?


https://gre.myprepclub.com/forum/3-liters-of-solution-with-45-concentration-23689.html#p75350
https://gre.myprepclub.com/forum/solution-x-is-10-percent-alcohol-by-volume-and-solution-y-i-55.html#p63849
https://gre.myprepclub.com/forum/a-cleaning-solution-mixture-20366.html#p60229
https://gre.myprepclub.com/forum/solution-y-is-40-percent-sugar-by-volume-and-solution-x-is-20-percent-22734.html#p69883
https://gre.myprepclub.com/forum/marcia-has-2-liters-l-of-a-60-concentrated-solution-of-ph-11653.html#p74693
https://gre.myprepclub.com/forum/if-there-are-10-liters-of-a-20-solution-of-alcohol-how-much-water-sh-22743.html#p76952
https://gre.myprepclub.com/forum/topic9375.html#p74291
User avatar
D
Carcass
Verbal Expert
Joined: 18 Apr 2015
Posts: 30104
Own Kudos [?]: 36536 [1]
Given Kudos: 25966
Send PM
Re: Certain amount of solution with 20% concentration of salt ... [#permalink] New post   19 Aug 2021, 04:44
1
Expert Reply
aishumurali wrote:
Are there more sums like this to practise?


Just click above in the first post the tag mixture problems aND YOU WILL HAVE THE FOLLOWING

https://gre.myprepclub.com/forum/search.ph ... tag_id=359

The tags are a very powerful resource to exploit

Regards
avatar
B
LamoBear02
Intern
Intern
Joined: 12 May 2023
Posts: 20
Own Kudos [?]: 16 [1]
Given Kudos: 65
GRE 1: Q154 V154
Send PM
Re: Certain amount of solution with 20% concentration of salt ... [#permalink] New post   01 Aug 2023, 00:06
1
I approached this problem in a weird but I got the answer so idk if it's the most reliable way;
1) I Knew that S1 has 20% of salt and S2 has 30% of salt. when added with each other the new soln has 24% salt so:
20----24------30. as we can see that 24 is closer to 20 so the new soln contains more of S1 and ratio of S1 and S2 in the new soln, let's say Y is S1:S2 = 6:4.
2) We know that 4 litre of S2 was added. so by going with the current Ratio we'd have 4 litres of S2 and 6 litres of S1.
3) Problem solved? Not so fast. We know that before adding S2, S1 was heated to lose half of its volume. So, the initial would have been twice the volume of S1 currently which is 6. so S1 (initially) would have been 12. so, 6 ounces of it were heated.
Carcass, Greenlight Test Prep could you evaluate and verify (if true) my approach?
avatar
B
Tariq16s
Intern
Intern
Joined: 05 Oct 2023
Posts: 1
Own Kudos [?]: 0 [0]
Given Kudos: 0
Send PM
Re: Certain amount of solution with 20% concentration of salt ... [#permalink] New post   26 Jun 2024, 17:00
didn't the salt conc. Increase After evaporation?

Posted from my mobile device
avatar
B
Mridu2024
Intern
Intern
Joined: 08 Jun 2024
Posts: 21
Own Kudos [?]: 13 [1]
Given Kudos: 16
Send PM
Re: Certain amount of solution with 20% concentration of salt ... [#permalink] New post   28 Jun 2024, 03:46
1
Find the salt content in the original solution with 20 percent salt concentration. Let us consider total volume of solution is x liters, so after heating the amount remain shall be x/2 liters. This x/2 liters is what is to be found out.
Now , salt content of it shall be 20 percent of x/ 2 = x/10
The new solution added is 30 percent salt by concentration and volume is 4 liters, so salt in it is 30/100 of 4 liters = 1.2 liters.

Now according to the problem

x/10 + 1.2 = ( x/2 + 4) * 24/100

solving X = 6
Prep Club for GRE Bot
gmatclubot
Re: Certain amount of solution with 20% concentration of salt ... [#permalink]
28 Jun 2024, 03:46
Moderators:
adewale223
GRE Instructor
86 posts
bronaugust
GRE Forum Moderator
37 posts
BrushMyQuant
Moderator
1111 posts
VibhuAnurag
GRE Instructor
234 posts

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

Main navigation

Partners

GRE Resources

www.ets.org/gre | About | Terms and Conditions and Privacy Policy | Prep Club for GRE Rules | Contact