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.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

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:

Solution Y is 30 percent liquid X and 70 percent water. If 2 [#permalink]
18 Jul 2004, 22:13

00:00

A

B

C

D

E

Difficulty:

65% (hard)

Question Stats:

65% (02:58) correct
35% (02:08) wrong based on 163 sessions

Solution Y is 30 percent liquid X and 70 percent water. If 2 kilograms of water evaporate from 8 kilograms of solution Y and 2 kilograms of solution Y are added to the remaining 6 kilograms of liquid, what percent of this new solution is liquid X?

Y has 30% X and 70% of water
therefore 8kg of Y wd hv 2.4kg X and 5.6 of Water
if 2 kg of water evaporates, then water left is 3.6
2 kg of solution Y is added so it wd add 0.6 kg of X and 1.4 kg of water.
thus we have 3(2.4+0.6) kg of X in 8 kg(6+2 added) of solution Y which is 3/8 fraction or (3/8)*100% of solution X in the new mixture which comes to 37.5%
i cant think of any faster solution..if there is,please let me know friends _________________

I agree with viveksah and I might have done the same thing. But in general with mixture problems, I always make a quick chart that's designed to line everything up properly. In this case, the chart looked like this:

Note: The zero in the percent of water after the water evaporated is just a place holder, not a zero. I just didn't bother calculating it since it's not important.

From here, I can see that 5/8 of the new mixture are water, so 3/8 are liquid x. I chose to do the whole chart in water because water is what evaporated from the original.

whenever there's a mixture problem, there's always the whole, the percentage, and then the part. If you line it all up properly, and add down, the chart takes care of the rest.

The question is: what percent of this new solution is liquid X? That is the ratio of liquid x to solution y. So you only need to find out the eventual kilograms of liquid x and kilograms of solution y.
liquid x is consisted of two parts:
part 1: the original part ---- 30% x 8 kg
part 2: the added liquid x part ---- 30% x 2 kg
So the total of liquid x is 30% x 8 + 30% x 2 = 30% (8 + 2) = 3
The eventual solution y is 8 kg, which is very obvious, so you can write it this way:

Re: Solution Y is 30 percent liquid X and 70 percent water. If 2 [#permalink]
25 Nov 2013, 07:40

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. _________________

Re: Solution Y is 30 percent liquid X and 70 percent water. If 2 [#permalink]
25 Nov 2013, 07:47

1

This post received KUDOS

Expert's post

Solution Y is 30 percent liquid X and 70 percent water. If 2 kilograms of water evaporate from 8 kilograms of solution Y and 2 kilograms of solution Y are added to the remaining 6 kilograms of liquid, what percent of this new solution is liquid X? A. 30% B. 33 1/3% C. 37 1/2% D. 40% E. 50%

In 8 kilograms of solution Y there are 0.3*8=2.4 kilograms of solution X;

After 2 kilograms of water are replaced by 2 kilograms of solution Y, to the existing 2.4 kilograms of solution X, 0.3*2=0.6 kilograms of solution X are added, so in the new solution of 8 kilograms there are 2.4+0.6=3 kilograms of solution X, which is 3/8*100=37.5% of this new solution.

Re: Solution Y is 30 percent liquid X and 70 percent water. If 2 [#permalink]
18 Apr 2014, 20:37

30%X | 70%W

Step 1: 2.4 X | 5.6 W

Step 2: 2.4 X | 3.6 W

Step 3: +0.6 X | + 1.4 W

Final: 3 X | 5 W

Proportion

3/8 * 100 = 75/2 _________________

Rgds, TGC! _____________________________________________________________________ I Assisted You => KUDOS Please _____________________________________________________________________________

gmatclubot

Re: Solution Y is 30 percent liquid X and 70 percent water. If 2
[#permalink]
18 Apr 2014, 20:37

Low GPA MBA Acceptance Rate Analysis Many applicants worry about applying to business school if they have a low GPA. I analyzed the low GPA MBA acceptance rate at...

Every student has a predefined notion about a MBA degree:- hefty packages, good job opportunities, improvement in position and salaries but how many really know the journey of becoming...