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

 It is currently 27 Jun 2019, 03:51 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

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.  The ratio of x to y to z is 3 : 4 : 12. If the ratio is changed so

Author Message
TAGS:

Hide Tags

Math Expert V
Joined: 02 Sep 2009
Posts: 55804
The ratio of x to y to z is 3 : 4 : 12. If the ratio is changed so  [#permalink]

Show Tags 00:00

Difficulty:   25% (medium)

Question Stats: 80% (01:49) correct 20% (01:58) wrong based on 94 sessions

HideShow timer Statistics The ratio of x to y to z is 3 : 4 : 12. If the ratio is changed so that the ratio of x to z is doubled and the ratio of y to z is halved which of the following is the new ratio?

A. 6 : 2 : 24
B. 6 : 1 : 24
C. 6 : 1 : 12
D. 3 : 1 : 6
E. 3 : 8 : 6

_________________
examPAL Representative P
Joined: 07 Dec 2017
Posts: 1072
Re: The ratio of x to y to z is 3 : 4 : 12. If the ratio is changed so  [#permalink]

Show Tags

Bunuel wrote:
The ratio of x to y to z is 3 : 4 : 12. If the ratio is changed so that the ratio of x to z is doubled and the ratio of y to z is halved which of the following is the new ratio?

A. 6 : 2 : 24
B. 6 : 1 : 24
C. 6 : 1 : 12
D. 3 : 1 : 6
E. 3 : 8 : 6

As all possible options are in front of us, we'll check the answers.
This is an Alternative approach.

(A) the ratio of x:z is 6:24 = 3:12, the same as the original. No!
(B) the ratio of x:z is 6:24 = 3:12, the same as the original. No!
(C) the ratio of x:z is 6:12, twice the original. Good! The ratio of y:z is 1:12, one fourth of the original. No!
(D) the ratio of x:z is 3:6=6:12, twice the original. Good! The ratio of y:z is 1:6=2:12, one half of the original. Yes!

(D) is our answer, there is no need to test (E) as well.
_________________
Intern  B
Joined: 24 Aug 2014
Posts: 2
Re: The ratio of x to y to z is 3 : 4 : 12. If the ratio is changed so  [#permalink]

Show Tags

At first double x to double x:z ratio and then halve y to make the y:z ratio 1/2 of original.
We get 6:2:12 which gets reduced to 3:1:6....making option D the correct answer,
CEO  V
Joined: 12 Sep 2015
Posts: 3787
Re: The ratio of x to y to z is 3 : 4 : 12. If the ratio is changed so  [#permalink]

Show Tags

1
Top Contributor
Bunuel wrote:
The ratio of x to y to z is 3 : 4 : 12. If the ratio is changed so that the ratio of x to z is doubled and the ratio of y to z is halved which of the following is the new ratio?

A. 6 : 2 : 24
B. 6 : 1 : 24
C. 6 : 1 : 12
D. 3 : 1 : 6
E. 3 : 8 : 6

GIVEN: x : y : z = 3 : 4 : 12

The ratio is changed so that the ratio of x to z is doubled
We get x : y : z = 6 : 4 : 12

The ratio is changed so that the ratio of y to z is halved
We get x : y : z = 6 : 2 : 12

We can simplify 6 : 2 : 12 by dividing all three parts by 2.
We get: 3 : 1 : 6

_________________ Re: The ratio of x to y to z is 3 : 4 : 12. If the ratio is changed so   [#permalink] 23 Sep 2018, 09:08
Display posts from previous: Sort by

The ratio of x to y to z is 3 : 4 : 12. If the ratio is changed so  