Mixture

Expert replies

dtweah: Master | Next Rank: 500 Posts; Posts: 487; Joined: Fri Mar 27, 2009 5:49 am; Thanked: 36 times

by dtweah » Sun May 17, 2009 5:42 am

Container A has 10 pounds of water and container B has 10 pounds of a 20% salt solution. Five pounds are transferred from A to B and mixed with B, and then y pounds are transferred from B to A and mixed with A. If the final mixture in A is a 5% salt solution then y equals

a) 3
(b) 7/2
(c) 17/6
(d) 25/9
(e) 4

Like this post

Source: Beat The GMAT — Problem Solving | Sun May 17, 2009 5:42 am

PAB2706: Master | Next Rank: 500 Posts; Posts: 260; Joined: Sun Oct 12, 2008 8:10 pm; Thanked: 4 times

by PAB2706 » Sun May 17, 2009 6:18 am

i got answer as A ie 3 pounds

dont know if i am doing it the right way...but here goes my method

cont A =10

cont B= 10 ( 8 pound water 2 pound salt )

no after transfer cont B contains 15 pounds solution ( 86.67% water and 13.33% salt )

now when you transfer y pounds in cont A again, the water : salt proportion in every pound of solution in B is going to remain the same. ie 86.67 % and 13.33%

Thus y pounds will contain 13.33% salt

now after transfer cont A has 5% salt

thus we can form salt equation as 0.05( 5+y)=0.133y

solving this you get y=3.125.. but since 0.133 is recurring decimal the value of y will tend towards 3.

If i am wrong i am missing something.
:roll:

Like this post

criszerriny: Junior | Next Rank: 30 Posts; Posts: 19; Joined: Mon Apr 20, 2009 2:25 pm

by criszerriny » Sun May 17, 2009 7:16 am

A is left with 5, B now has 15, 2/15 is the salt solution in B.

Now, as you put B into A, you are going to have an equation of,

((2/15)y)/(y+5)=.05

1.25y=3.75
y=3

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

560 reviews

1168 reviews

431 reviews

359 reviews

147 reviews

5/5

5 Star (560 Reviews)

"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."

"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."

"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."

Write a Review