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

It is currently 16 Sep 2014, 22:17

Close

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Maths

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Intern
Intern
avatar
Joined: 16 Apr 2010
Posts: 23
Followers: 0

Kudos [?]: 4 [0], given: 0

Maths [#permalink] New post 21 Jul 2010, 12:10
Can anybody explain the answer for the following questions?

1. For finite sequence of non zero, the number of variations in sign is defied as the number of pairs of consective terms of the sequence for which the product of the two consecutive term is negative. What is the numbr of variation in sign for the sequence of
1, -3, 2, 5, -4, 6?


2. According to the directions on a can of frozen organge juice concentrate, 1 can of concentrate is to be mixed with 3 cans of water to make orange juice. How many 12 ounce cans of the concentrate are required to prepare 200 6 ounce servings of orange juice?
a) 25 b)34 c)50 d)67 e)100


Data sufficeny

3. At certain pet shop, 1/3 of the pets are dogs and 1/5 of the pets are birds. How many of the pets are dogs?
A. there are 30 birds at the pets shop
B. There are 20 more dogs at the pets shop

4. Did it take Pei more than 2 hrs to walk a distance of 10miles along a certain trail (1 mile =1.6km)
A. Pei walked this distance at an average rate of less than 6.4 kilometer per hours
B. On average, it took Pei more than 9 minutes per kilometer to walk this distance.
Kaplan GMAT Prep Discount CodesKnewton GMAT Discount CodesManhattan GMAT Discount Codes
1 KUDOS received
Senior Manager
Senior Manager
User avatar
Status: Time to step up the tempo
Joined: 24 Jun 2010
Posts: 410
Location: Milky way
Schools: ISB, Tepper - CMU, Chicago Booth, LSB
Followers: 7

Kudos [?]: 117 [1] , given: 50

Re: Maths [#permalink] New post 01 Aug 2010, 16:38
1
This post received
KUDOS
My attempt.

2. According to the directions on a can of frozen orange juice concentrate, 1 can of concentrate is to be mixed with 3 cans of water to make orange juice. How many 12 ounce cans of the concentrate are required to prepare 200 6 ounce servings of orange juice?
a) 25 b)34 c)50 d)67 e)100

Let us assume the base to be a 6 ounce cup.

Orange juice is a ratio of 1:3 (Concentrate: Water)

To prepare a 200 servings of juice we require 50 units (6 ounces) of concentrate and 150 units of water.

Hence 50 units (6 ounces) of concentrate => 25 units (12 ounces) of concentrate.

Answer: A
-----------------------------------------------------------------------------------------------------------------------Data sufficiency

3. At certain pet shop, 1/3 of the pets are dogs and 1/5 of the pets are birds. How many of the pets are dogs?
A. there are 30 birds at the pets shop
B. There are 20 more dogs at the pets shop

Solution:

Statement A:
1/5th of the pets are birds corresponds to the 30 birds. Hence the total number of pets is 150.

1/3rd of the pets are dogs => 1/3rd of150 => 50 dogs.

Statement A is sufficient.

Statement B:

Here I am not sure of whether to read the statement in relation with only the two kinds of pets (dogs and birds) or to read it as it is, without any relation.

Assuming that the statement reads like "There are 20 more dogs (than birds) at the pets shop" and proceeding further....

With the ratio of dogs and birds as 1/3: 1/5 => 5x:3x

Hence 5x-3x = 20

x=20 Hence number of dogs is 50.

Answer: D

-----------------------------------------------------------------------------------------------------------------------

4. Did it take Pei more than 2 hrs to walk a distance of 10miles along a certain trail (1 mile =1.6km)
A. Pei walked this distance at an average rate of less than 6.4 kilometer per hours
B. On average, it took Pei more than 9 minutes per kilometer to walk this distance.

Solution:
Make all the units common and hence 10 mile => 16 km.

Statement A:
If Pei walked at a rate of 6.4 km/hr she would have taken more than 2 hours and since she walked slower than 6.4 km/hr she would have taken more than 2 hours.

Sufficient.

Statement B:

In order for Pei to have covered the distance of 16 km she should have covered at least 2 km per 15 minutes. With statement B, if Pei took exactly 9 mins per km then she would have covered 2 km every 18 minutes.
Since she took more than 9 min per km she would have definitely taken more than 2 hours to cover the 16 km.

Sufficient.

Answer: D

-----------------------------------------------------------------------------------------------------------------------


@ kilukilam

Kindly post the correct answer.
_________________

:good Support GMAT Club by putting a GMAT Club badge on your blog :thanks

GMAT Forum Moderator
avatar
Status: Accepting donations for the mohater MBA fund
Joined: 05 Feb 2008
Posts: 1860
Location: United States
Concentration: Healthcare, Economics
Schools: Ross '14 (M)
GMAT 1: 710 Q48 V38
GMAT 2: Q V
GPA: 3.54
WE: Accounting (Manufacturing)
Followers: 54

Kudos [?]: 398 [0], given: 234

GMAT ToolKit User GMAT Tests User Premium Member Reviews Badge
Re: Maths [#permalink] New post 01 Aug 2010, 17:52
#1:
Maths is not a word.

#2
Please search before posting questions and post in the correct section.


Questions already answered:
First one:
maths-97662.html
Second one:
ratio-question-source-gmat-prep-74955.html
Third one:
pet-shop-problem-58028.html
Fourth one:
rate-58419.html

Thread locked, user banned for a week as the user is a repeat offender.
_________________

Strategy Discussion Thread | Strategy Master | GMAT Debrief| Please discuss strategies in discussion thread. Master thread will be updated accordingly. | GC Member Write Ups

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Re: Maths   [#permalink] 01 Aug 2010, 17:52
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic Maths abhi398 1 23 Sep 2011, 13:34
3 Math sudai 4 18 Apr 2010, 12:40
MATHS sr 4 09 Feb 2009, 10:51
5 Math rhyme 10 02 Apr 2008, 19:39
Math reshamad 5 04 Apr 2006, 16:56
Display posts from previous: Sort by

Maths

  Question banks Downloads My Bookmarks Reviews Important topics  

Moderators: bagdbmba, WaterFlowsUp



GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

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®.