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Register now and save up to $200 Available with Beat the GMAT members only code ## GMATPrep Questions This topic has 2 expert replies and 14 member replies Goto page • 1, • 2 prasant Junior | Next Rank: 30 Posts Joined 18 Nov 2006 Posted: 14 messages #### GMATPrep Questions Sun May 13, 2007 1:14 pm Elapsed Time: 00:00 • Lap #[LAPCOUNT] ([LAPTIME]) Hey Guys, I just finished taking a GMATPrep Practice Test and got the following quant questions wrong. Can someone please help me solve these problems? (I have fixed the mistake I made in #26) Thanks Need free GMAT or MBA advice from an expert? Register for Beat The GMAT now and post your question in these forums! prasant Junior | Next Rank: 30 Posts Joined 18 Nov 2006 Posted: 14 messages Sun May 13, 2007 1:16 pm Thanks to a lot that I learnt on this forum, I am finally getting to where I wanna be: I have my test scheduled for May 19. ### GMAT/MBA Expert Stacey Koprince GMAT Instructor Joined 27 Dec 2006 Posted: 2228 messages Followed by: 680 members Thanked: 639 times GMAT Score: 780 Thu May 17, 2007 7:25 pm Hi - you'll be more likely to get replies if you break your questions up into separate posts - most people who see so many questions in a row will be overwhelmed and move to another post. _________________ Please note: I do not use the Private Messaging system! I will not see any PMs that you send to me!! Stacey Koprince GMAT Instructor Director of Online Community Manhattan GMAT Contributor to Beat The GMAT! Learn more about me Free Manhattan Prep online events - The first class of every online Manhattan Prep course is free. Classes start every week. atarafder Junior | Next Rank: 30 Posts Joined 12 May 2007 Posted: 17 messages Fri May 18, 2007 2:26 pm 17. If Don had travelled the whole of x-miles at 60 mph, his travel time would have been t= x/60 His actual travel time is = (x-5)/60 + 5/30 = x/60 + 1/12 This means that his travel time was increased by 1/12 hours. =(1/12)*100/x/60 = 500/x % atarafder Junior | Next Rank: 30 Posts Joined 12 May 2007 Posted: 17 messages Fri May 18, 2007 2:32 pm 26. 1. Insufficient 2. for the tip t be$8 the bill must be >=40 and 15% of 49 <$7.5, so sufficient atarafder Junior | Next Rank: 30 Posts Joined 12 May 2007 Posted: 17 messages Fri May 18, 2007 2:41 pm 33.Let the # of cameras produced in 1993 = 100 # of cameras in 1994 (x% more of that produced in 1993) = 100*(100+x)/100 = 100 + x # of cameras produced in 1995 (y% more than that produced in 1994) = (100+y) (100+x)/100 = 100 (1 + x+y + xy/100) 1. Insufficent 2. Sufficient bww Senior | Next Rank: 100 Posts Joined 29 Apr 2007 Posted: 55 messages Thanked: 1 times Fri May 18, 2007 3:25 pm For #26... Isn't 1) sufficient? We know that Martin takes the tens digit of the amount of his bill x2 as the amount of his tip. Assuming his bill is$16, he would then leave a $2 tip. 15% of 16 if$1.80, so yes, the tip is greater than 15% of the amount of the bill. A 15% tip on a $49 bill would be$7.35, but Martin's rule of thumb has him leaving $8 as a tip. So, 1) is sufficient. 2) If he leaves an$8 tip, then his bill must have been between $40-49. 15% tip on$40 is $6, and$7.35 on a $49 tab. 2) alone must also be sufficient... Answer is D? prasant Junior | Next Rank: 30 Posts Joined 18 Nov 2006 Posted: 14 messages Fri May 18, 2007 8:50 pm Guys, Thanks for the responses. Very helpful. Sadowski Senior | Next Rank: 100 Posts Joined 27 Apr 2007 Posted: 91 messages Thanked: 1 times Test Date: 6/28/07 Target GMAT Score: 730 Mon May 21, 2007 6:33 am bww wrote: For #26... Isn't 1) sufficient? We know that Martin takes the tens digit of the amount of his bill x2 as the amount of his tip. Assuming his bill is$16, he would then leave a $2 tip. 15% of 16 if$1.80, so yes, the tip is greater than 15% of the amount of the bill. A 15% tip on a $49 bill would be$7.35, but Martin's rule of thumb has him leaving $8 as a tip. So, 1) is sufficient. 2) If he leaves an$8 tip, then his bill must have been between $40-49. 15% tip on$40 is $6, and$7.35 on a $49 tab. 2) alone must also be sufficient... Answer is D? Actually, 15% of$16 is $2.40, so his$2 tip is not greater than 15%. B is the only sufficient answer.

mikeclarke44 Junior | Next Rank: 30 Posts
Joined
09 Jun 2007
Posted:
13 messages
Sun Jun 10, 2007 1:33 pm
#27
I don't know why they posted it incorrect. I come up with a value for r when I use #1 and #2

1). r=3m
2). r/2 + m/2 =12 r + m = 24

3m + m = 24
4m = 24
m= 6, r=18

That answer should have been (C)

mikeclarke44 Junior | Next Rank: 30 Posts
Joined
09 Jun 2007
Posted:
13 messages
Sun Jun 10, 2007 1:34 pm
#27
I don't know why they posted it incorrect. I come up with a value for r when I use #1 and #2

1). r=3m
2). r/2 + m/2 =12 r + m = 24

3m + m = 24
4m = 24
m= 6, r=18

That answer should have been (C)

vrider Junior | Next Rank: 30 Posts
Joined
01 May 2007
Posted:
17 messages
Sun Jun 10, 2007 3:18 pm
From (1) r=3m , insufficient
From (2) r-12 = 12-m , insufficient

combining, r-12 = 12 - r/3
4/3*r = 24 or r = 18

So, C?

Hmm...I think I am missing something here...let me check.

vrider Junior | Next Rank: 30 Posts
Joined
01 May 2007
Posted:
17 messages
Sun Jun 10, 2007 3:27 pm
Ok, I think I know why. Assumption that r=3m is wrong. If m is negative, distance from 0 to r can still be 3 times distance from m to 0 i.e. r=3m or r = -3m.

Hence, combining (1) & (2) is still insufficient to find r.

restero Newbie | Next Rank: 10 Posts
Joined
14 Apr 2009
Posted:
4 messages
Tue Mar 09, 2010 10:23 am
#27 is E
as r=3m or r=-3m

solving u get 6, 18 and -12, 36; So E!

harsh001 Newbie | Next Rank: 10 Posts
Joined
12 Mar 2010
Posted:
6 messages
Sat Mar 13, 2010 5:57 pm
#19

Let X = 1 and Y = 2 then equation = -1/3 < 1
Let X = 1 and Y = -2 then equation = -3/2 < 1
Let X =0 and Y = 1 then equation = 1 = 1
Let X = 0 and Y =-1 then equation = -1 < 1
Let X = -1 and Y = 2 then equation = -3 < 1
Let X =-1 and Y = -2 then equation = -1/3 < 1

therefore in all cases the equation in not greater than 1 if we take similar values of condition 2 we will see that each condition in its own answers the question therefore D is the answer!!

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