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

 It is currently 30 Aug 2014, 10:43

### 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

# 3 hard bin GmatPrep questions!!

Author Message
TAGS:
Intern
Joined: 21 Jan 2007
Posts: 24
Followers: 0

Kudos [?]: 1 [0], given: 0

3 hard bin GmatPrep questions!! [#permalink]  01 Mar 2007, 09:05
Could u help me out with these 3 questions?? The OA is the one circled in blue (while the other is the one i picked =( )

These should be from the hardest ones found on GmatPrep, as i scored 50 in Quant section...

Please provide extensive explanation to the solution, cause i really don't know how to get it!!

Thanks

Riccardo
Attachments

4.jpg [ 110.8 KiB | Viewed 454 times ]

3.jpg [ 124.59 KiB | Viewed 455 times ]

1.jpg [ 105.29 KiB | Viewed 455 times ]

 Kaplan Promo Code Knewton GMAT Discount Codes Veritas Prep GMAT Discount Codes
Senior Manager
Joined: 18 Feb 2007
Posts: 256
Followers: 1

Kudos [?]: 1 [0], given: 0

1) (the other 2 on the way)

D = R*T

total time = 10/(25/1) + 50/(40/1)

total dist/total time = total avg rate
(10+50)/(10/(25/1) + 50/(40/1)) ~ 36.xx
Senior Manager
Joined: 18 Feb 2007
Posts: 256
Followers: 1

Kudos [?]: 1 [0], given: 0

2) tricky tricky..

m could be 6, r could be 18
m could be -12, r could be 36

1) abs(r) = abs(3m)
2) (m+r)/2 = 12

A) r = -3m
(m-3m)/2 = 12
m = -12

B) r = 3m
(m+3m)/2 = 12
m = 6

Last edited by CookieMonster on 01 Mar 2007, 10:27, edited 1 time in total.
Senior Manager
Joined: 18 Feb 2007
Posts: 256
Followers: 1

Kudos [?]: 1 [0], given: 0

primes have no factors other than 1 and itself
f(7) .. 6,5,4,3,2,1 total of 6
f(13), 12,11...1 total of 12

f(p) = p-1
Intern
Joined: 13 Jan 2007
Posts: 30
Location: India
Followers: 0

Kudos [?]: 1 [0], given: 0

City
25 M = 1 G
1 M = 1/25 G
10 M = 1/25 * 10 = 2/5 G

Highway
40 M = 1 G
1 M = 1/40 G
50 M = 1/40 * 50 = 5/4 G

Avg Rate @ 10M in city and 50 M in Highway = Total Miles / Total Gallons
Total Miles = 10 + 50 = 60
Total Gallons = 5/2 + 5/4 = 33/20
=> (60)/(33/20) = 36.36 ~ 36
Manager
Joined: 09 Jan 2007
Posts: 242
Followers: 1

Kudos [?]: 5 [0], given: 0

auniyal wrote:

City
25 M = 1 G
1 M = 1/25 G
10 M = 1/25 * 10 = 2/5 G

Highway
40 M = 1 G
1 M = 1/40 G
50 M = 1/40 * 50 = 5/4 G

Avg Rate @ 10M in city and 50 M in Highway = Total Miles / Total Gallons
Total Miles = 10 + 50 = 60
Total Gallons = 5/2 + 5/4 = 33/20
=> (60)/(33/20) = 36.36 ~ 36

I think total galons would be 2/5 + 5/4, though result you typed right, i.e., 33/20
Similar topics Replies Last post
Similar
Topics:
2 GMAT Prep CR question that is hard - Table attached 9 13 Apr 2012, 04:57
OG11 hard bin questions . any idea 5 19 Apr 2007, 00:01
3 of the hardest questions in GmatPrep! 2 06 Mar 2007, 04:01
GmatPrep: hard DS 8 28 Sep 2006, 15:06
HARD PS GMAT PREP 1 06 Aug 2006, 14:34
Display posts from previous: Sort by