GMATPrep - math questions : Quant Question Archive [LOCKED]
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 16 Jan 2017, 21:46

### 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

# GMATPrep - math questions

Author Message
Manager
Joined: 21 Mar 2005
Posts: 115
Location: Basel
Followers: 1

Kudos [?]: 9 [0], given: 0

### Show Tags

19 Nov 2006, 06:30
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Dear All
Attached some GMATprep questions that I got wrong and I donÂ´t really know were my mistakes are. I would very much appreciate your help!
Thanks!!
Attachments

GPrep2 Math.xls [175 KiB]

SVP
Joined: 01 May 2006
Posts: 1797
Followers: 9

Kudos [?]: 149 [0], given: 0

### Show Tags

19 Nov 2006, 07:07
Hi tobiastt

The answer (B) is ok. The statment precises "for all integers n".

U are taking the case of 0x0 = 0 but 1x1 = 1 so it's not the multiplication (nxn = n^2) . It remains only the substraction n - n = 0.
SVP
Joined: 05 Jul 2006
Posts: 1743
Followers: 6

Kudos [?]: 313 [0], given: 49

### Show Tags

19 Nov 2006, 07:15
# is either one of the four basic operations +.x,/ or -

what is 1 # 2

1) n#0 = n for all intigers n

2)n#n=0 for all intigers n

from one

n#0 = 0

n could be zero or any +ve intiger or -ve

if n is any +ve or -ve intiger thus # is either + -

if n = zero thus # is + - or x

either ways # cant be devision

we can never know 1#2 because # could be
+ or minus ........insuff

from two

EITHER n= zero and # is not devision and could be - or + or x

OR n is +ve or -ve intiger thus # is minus.............

1,2 are not zero

thus 1#2 is a subtraction operation

suff

i say b
Manager
Joined: 03 Jul 2005
Posts: 192
Location: City
Followers: 1

Kudos [?]: 10 [0], given: 0

### Show Tags

19 Nov 2006, 08:13
If (400)(6000) = (240)(100^x), what is the value of x?

First work out what 400 * 6000 is. This is easy 6 *4 = 24 plus add the missing zeros = 2,400,000.

We know that to get 240 to equal 2,400,000 then we need to multiply 240 by 10000 this is 100 * 100 = 10000. So 100^2

The answer is X = 2
Manager
Joined: 21 Mar 2005
Posts: 115
Location: Basel
Followers: 1

Kudos [?]: 9 [0], given: 0

### Show Tags

19 Nov 2006, 13:13
thanks for the replies. Yes, I always catch myself doing the same silly mistakes over and over. I have to find a way to overcome that.
19 Nov 2006, 13:13
Display posts from previous: Sort by