Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 25 Sep 2016, 13:50

### 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
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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Of 220 stamps in a certain stamp collection, exactly 60 were

 post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
Eternal Intern
Joined: 07 Jun 2003
Posts: 467
Location: Lone Star State
Followers: 1

Kudos [?]: 134 [0], given: 0

Of 220 stamps in a certain stamp collection, exactly 60 were [#permalink]

### Show Tags

15 Jul 2003, 20:35
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Of 220 stamps in a certain stamp collection, exactly 60 were U.S. Stamps and 110 were canceled. If 60 percent of the U.S. stamps were canceled, how many of the stamps were both not U.S. stamps and not canceled?

Idiots choose 50 and go to hell during GMAT!
Director
Joined: 03 Jul 2003
Posts: 652
Followers: 3

Kudos [?]: 81 [0], given: 0

[#permalink]

### Show Tags

15 Jul 2003, 20:46
My Ans: 86
Is it correct?
Eternal Intern
Joined: 07 Jun 2003
Posts: 467
Location: Lone Star State
Followers: 1

Kudos [?]: 134 [0], given: 0

[#permalink]

### Show Tags

15 Jul 2003, 20:47
Well, I need the explanations!! Please posting answers doesn't help anyone we need reasoning and rationale!

Manager
Joined: 18 Jun 2003
Posts: 141
Location: Hockeytown
Followers: 3

Kudos [?]: 27 [0], given: 0

[#permalink]

### Show Tags

15 Jul 2003, 21:36
Draw a matrix with US/Non-US on one axis, Cancel/Non-Cancel on the other.

You have a 2x2 (4 sections):
1. US, Cancel
2. US, non-Cancel
3. non-US, Cancel
4. non-US, non-Cancel [what the question asks for]

[1+3] = 110. [1+2] = 60. 60% of [1+2] are cancelled, so 60% of 60 are cancelled. So 36 US are cancelled. So [1] = 36.

Since [1] = 36 and [1+3] = 110, [3] = 110-36 = 74.
Since [1] = 36 and [1+2] = 60, [2] = 24.

Now you have [1], [2], and [3], but the question asks for [4].

220 - [1] - [2] - [3] = [4]
220 - 36 - 24 - 74 = 86
SVP
Joined: 03 Feb 2003
Posts: 1603
Followers: 8

Kudos [?]: 224 [0], given: 0

[#permalink]

### Show Tags

15 Jul 2003, 22:40
draw a chart -- all will be clear
Eternal Intern
Joined: 07 Jun 2003
Posts: 467
Location: Lone Star State
Followers: 1

Kudos [?]: 134 [0], given: 0

That is definitely the clearest way [#permalink]

### Show Tags

16 Jul 2003, 05:34
Easiest way is J.P.'s , that's the best way, you deserve a pat on the back for that.

Another way:

1) Start with 220
2) Subtract total U.S. 60

3) 36 cancel, U.S. 24 U.S.
4) 74 cancel, non U.S. 36 U.S. canceled

The devil's trap is 50 if your not looking. This happens because you subtract out 36 twice. You cannot do this in Venn diagrams.
That is definitely the clearest way   [#permalink] 16 Jul 2003, 05:34
Display posts from previous: Sort by

# Of 220 stamps in a certain stamp collection, exactly 60 were

 post reply Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group and phpBB SEO 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®.