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

 It is currently 24 Sep 2018, 02:42

### 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

# A carton contains 30 pens, of which 20 are blue ink pens and 10 are

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 49381
A carton contains 30 pens, of which 20 are blue ink pens and 10 are  [#permalink]

### Show Tags

27 Dec 2017, 01:15
00:00

Difficulty:

25% (medium)

Question Stats:

93% (01:02) correct 7% (01:43) wrong based on 29 sessions

### HideShow timer Statistics

A carton contains 30 pens, of which 20 are blue ink pens and 10 are black ink pens. If 9 of the pens are removed, what is the new ratio of blue ink pens to black?

(1) Of the pens removed, the ratio of the number of black ink pens removed to the number of blue ink pens is 2 : 1.
(2) Of the first 7 pens that are removed, 5 are black.

_________________
examPAL Representative
Joined: 07 Dec 2017
Posts: 612
Re: A carton contains 30 pens, of which 20 are blue ink pens and 10 are  [#permalink]

### Show Tags

27 Dec 2017, 02:09
Bunuel wrote:
A carton contains 30 pens, of which 20 are blue ink pens and 10 are black ink pens. If 9 of the pens are removed, what is the new ratio of blue ink pens to black?

(1) Of the pens removed, the ratio of the number of black ink pens removed to the number of blue ink pens is 2 : 1.
(2) Of the first 7 pens that are removed, 5 are black.

To solve this we'll look for options which give a specific number of blue or black ink pens.
This is a Logical approach.

(1) We have a total number of pens (9) and the ratio inside these 9 (2:1).
This is sufficient to calculate the exact ratio of pens by why bother?
Sufficient.

(2) We have information only on 7 of the 9 pens removed.
Insufficient.

_________________

Watch free GMAT tutorials in Math, Verbal, IR, and AWA.

GMAT test takers: Watch now the GMAC interview with the people who write the GMAT test!
We discussed the chances of improving a GMAT score; how important the first questions on the test are; what to do if you don’t have enough time to complete a whole section; and more.

You can watch all the action from the interview here.

Senior Manager
Joined: 07 Oct 2017
Posts: 273
Re: A carton contains 30 pens, of which 20 are blue ink pens and 10 are  [#permalink]

### Show Tags

27 Dec 2017, 04:36
Imo A
St1: 2x+x=9
We can find value of x and hence find the new ratio.

Sufficient

St2: don't have any information about remaining 2 pens
Insufficient

Sent from my ONEPLUS A3003 using GMAT Club Forum mobile app
_________________

Thank you =Kudos
The best thing in life lies on the other side of the pain.

Manager
Joined: 24 Nov 2016
Posts: 152
Re: A carton contains 30 pens, of which 20 are blue ink pens and 10 are  [#permalink]

### Show Tags

27 Dec 2017, 18:30
Bunuel wrote:
A carton contains 30 pens, of which 20 are blue ink pens and 10 are black ink pens. If 9 of the pens are removed, what is the new ratio of blue ink pens to black?

(1) Of the pens removed, the ratio of the number of black ink pens removed to the number of blue ink pens is 2 : 1.
(2) Of the first 7 pens that are removed, 5 are black.

(1) Of the pens removed, the ratio of the number of black ink pens removed to the number of blue ink pens is 2 : 1.

If removed ratio is $$black:blue=2x:1x$$ (where x is a multiplier), then $$2x+x=9$$, and $$x=9/3=3$$.
So, removed ratio is $$black:blue=2x:1x=6:3$$ and new ratio $$blue:black=20-6:10-3=14:7$$; sufficient.

(2) Of the first 7 pens that are removed, 5 are black. So out of 9 we know that 5 are black and 2 are blue, but we don't know the remaining 2; insufficient.

Re: A carton contains 30 pens, of which 20 are blue ink pens and 10 are &nbs [#permalink] 27 Dec 2017, 18:30
Display posts from previous: Sort by

# A carton contains 30 pens, of which 20 are blue ink pens and 10 are

## Events & Promotions

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.