It is currently 20 Apr 2018, 03:47

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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

How many computers did Michael, a salesman for the computer

Author Message
TAGS:

Hide Tags

Manager
Joined: 21 Sep 2012
Posts: 228
How many computers did Michael, a salesman for the computer [#permalink]

Show Tags

01 Nov 2012, 02:12
2
This post was
BOOKMARKED
00:00

Difficulty:

65% (hard)

Question Stats:

65% (01:59) correct 35% (01:56) wrong based on 153 sessions

HideShow timer Statistics

How many computers did Michael, a salesman for the computer company Digital Electronics Labs, sell this past year that had more than 4GB of RAM and the Microsoft Windows XP operating system? (Michael sold no computers with exactly 4GB of RAM)

(1) 40% of the 200 total computers that Michael sold had XP and less than 4GB of RAM; these computers represent 80% of the total computers that Michael sold with XP.
(2) 50% of the 200 total computers that Michael sold had XP. Of the computers that Michael sold without XP, half had more than 4GB of RAM while the other half had less than 4GB of RAM.
[Reveal] Spoiler: OA
Math Expert
Joined: 02 Sep 2009
Posts: 44573
Re: How many computers did Michael, a salesman for the computer [#permalink]

Show Tags

01 Nov 2012, 09:02
2
KUDOS
Expert's post
How many computers did Michael, a salesman for the computer company Digital Electronics Labs, sell this past year that had more than 4GB of RAM and the Microsoft Windows XP operating system? (Michael sold no computers with exactly 4GB of RAM)

We need to determine the number of computers sold with XP AND more than 4GB of RAM.

(1) 40% of the 200 total computers that Michael sold had XP and less than 4GB of RAM; these computers represent 80% of the total computers that Michael sold with XP.

0.4*200=80 computers had XP and less than 4GB of RAM. Since these 80 computers represent 80% of the computers with XP, then Michael sold 100 computers with XP. Since, we already know that 80 computers had XP and less than 4GB of RAM, then the rest of the computers with XP had more than 4GB of RAM, thus 100-80=20 computers had XP and more than 4GB of RAM. Sufficient.

(2) 50% of the 200 total computers that Michael sold had XP. Of the computers that Michael sold without XP, half had more than 4GB of RAM while the other half had less than 4GB of RAM

0.5*200=100 computers had XP and 100 did not. The second part of the statement gives info only about the computers without XP, thus it's basically useless for us. Not sufficient.

Hope it's clear.
_________________
Math Expert
Joined: 02 Aug 2009
Posts: 5769
Re: How many computers did Michael, a salesman for the computer [#permalink]

Show Tags

23 Dec 2017, 09:03
nelz007 wrote:
How many computers did Michael, a salesman for the computer company Digital Electronics Labs, sell this past year that had more than 4GB of RAM and the Microsoft Windows XP operating system? (Michael sold no computers with exactly 4GB of RAM)

(1) 40% of the 200 total computers that Michael sold had XP and less than 4GB of RAM; these computers represent 80% of the total computers that Michael sold with XP.
(2) 50% of the 200 total computers that Michael sold had XP. Of the computers that Michael sold without XP, half had more than 4GB of RAM while the other half had less than 4GB of RAM.

so we are looking for COMPUTERS sold that had>4GB RAM and XP OS..

(1) 40% of the 200 total computers that Michael sold had XP and less than 4GB of RAM; these computers represent 80% of the total computers that Michael sold with XP.
Total computers sold = 200,
40% of it so $$\frac{40}{100}*200=80$$ had <4GB and XP os
80% of Computers sold with XP os = 80, so computers sold with XP =$$80*\frac{100}{80}=100$$
so BOTH XP and >4GB = 100-80=20
suff

(2) 50% of the 200 total computers that Michael sold had XP. Of the computers that Michael sold without XP, half had more than 4GB of RAM while the other half had less than 4GB of RAM.
clearly insuff

A
_________________

Absolute modulus :http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

GMAT online Tutor

Re: How many computers did Michael, a salesman for the computer   [#permalink] 23 Dec 2017, 09:03
Display posts from previous: Sort by