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.

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

A tank contains 10,000 gallons of a solution that is 5 % [#permalink]
11 Oct 2005, 02:04

2

This post was BOOKMARKED

00:00

A

B

C

D

E

Difficulty:

15% (low)

Question Stats:

77% (01:59) correct
23% (01:08) wrong based on 166 sessions

A tank contains 10,000 gallons of a solution that is 5 percent sodium chloride by volume. If 2,500 gallons of water evaporate from the tank, the remaining solution will be approximately what percent sodium chloride?

Re: PS - Percents OG11 [#permalink]
11 Oct 2005, 02:48

nero44 wrote:

I think my brain evaporated, because I dont even get any of the solutions given...

A tank contains 10,000 gallons of a solution that is 5 percent sodium chloride by volume. If 2,500 gallons of water evaporate from the tank, the remaining solution will be approximately what percent sodium chloride?

(A) 1.25% (B) 3.75% (C) 6.25% (D) 6.67% (E) 11.7%

there're 5%*10,000(= 500 gallons) of NaCl in the solution
===> there're 9,500 (=10,000-500) gallons of water in the solution.
after 2,500 gallons of water evaporate, there's 7,000 gallons of water left ===> the percentage of NaCl is 500 gallons NaCl/ (500+7,000) ( this is the volume of the solution) *100%= 6,67% . It's D.

Re: PS - Percents OG11 [#permalink]
11 Oct 2005, 14:23

2

This post received KUDOS

Should be D

Original =10,000 ----> sodium chloride = 5% ie 500
New = 10,000-2,500 = 7500.

New % = (500/7500) * 100

= 6.67%

nero44 wrote:

I think my brain evaporated, because I dont even get any of the solutions given...

A tank contains 10,000 gallons of a solution that is 5 percent sodium chloride by volume. If 2,500 gallons of water evaporate from the tank, the remaining solution will be approximately what percent sodium chloride?

Re: A tank contains 10,000 gallons of a solution that is 5% [#permalink]
03 Mar 2012, 10:14

hi, everybody,

Sorry for raised this question again, but I a little bit confused with the question by itself.

Is that correct that if I interpret the question statement 'the remaining solution' (A) will be approximately what percent (B) 'sodium chloride'? as A=%B?

Re: A tank contains 10,000 gallons of a solution that is 5% [#permalink]
03 Mar 2012, 15:45

1

This post received KUDOS

Expert's post

Minhphuoc wrote:

A tank contains 10,000 gallons of a solution that is 5 percent sodium chloride by volume. If 2,500 gallons of water evaporate from the tank, the remaining solution will be approximately what percent sodium chloride?

(A) 1.25% (B) 3.75% (C) 6.25% (D) 6.67% (E) 11.7%

hi, everybody,

Sorry for raised this question again, but I a little bit confused with the question by itself.

Is that correct that if I interpret the question statement 'the remaining solution' (A) will be approximately what percent (B) 'sodium chloride'? as A=%B?

It makes me generate wrong answer!

Thanks

"The remaining solution will be approximately what percent sodium chloride?" means: what percent of the remaining solution is sodium chloride. Now, since the remaining solution is 10,000-2,500=7,500 gallons and sodium chloride is 500 gallons (5% of initial solution of 10,000 gallons) then sodium chloride is 500/7,500*100=~6.66% of the remaining solution of 7,500 gallons.

Re: A tank contains 10,000 gallons of a solution that is 5 % [#permalink]
27 Mar 2012, 21:30

I'm really slow with math, need suggestions.

I solved this question in 2 minutes 45 seconds and got the correct answer, but obviously my time was too slow. Any suggestions for how to complete this quickly? The slowest part for me was calculating what 500/7500 is.

This was my process: 500/7500 = 5/75 = 1/15.

Long division 1/15 = 6.6% (then looked for correct answer).

Any suggestions for how to do that calculation faster (beyond just memorizing) would be great!

Re: A tank contains 10,000 gallons of a solution that is 5 % [#permalink]
02 Oct 2013, 13:33

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. _________________