Last visit was: 24 Nov 2024, 02:07 It is currently 24 Nov 2024, 02:07
Decision Tracker
My Rewards
New comers' posts
New posts
Unanswered

Close

GRE Prep 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 GRE 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.

Go to My Error Log Learn more
Close

Request Expert Reply

Confirm Cancel
PREVIOUS TOPIC
NEXT TOPIC

While driving from city A to city B, a car got 22 miles per

Tags :
Find Similar Topics  About  Add a Tag

Show Tags
Hide Tags

User avatar
sandy
Retired Moderator
Joined: 07 Jun 2014
Posts: 4813
Own Kudos [?]: 11197 [22]
Given Kudos: 0
GRE 1: Q167 V156
WE:Business Development (Energy and Utilities)
Send PM
While driving from city A to city B, a car got 22 miles per [#permalink] New post   30 Aug 2018, 07:36
5
1
Expert Reply
16
Bookmarks
00:00

Question Stats:

43% (01:34) correct 56% (01:05) wrong based on 176 sessions

Hide Show timer Statistics

While driving from city A to city B, a car got 22 miles per gallon and while returning on the same road, the car got 30 miles per gallon.

Quantity A
Quantity B
The car’s average gas mileage for the entire trip, in miles per gallon
\(26\)


A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
ShowHide Answer
Official Answer
B
Most Helpful Expert Reply
User avatar
HappyMathtutor
Manager
Manager
Joined: 01 Nov 2018
Posts: 87
Own Kudos [?]: 144 [6]
Given Kudos: 0
Send PM
Re: While driving from city A to city B, a car got 22 miles per [#permalink] New post   13 Jan 2019, 22:37
5
Expert Reply
1
Bookmarks
We have one car that has 22 mpg
the other has 30 mpg

find the least common multiple.
22= 11*2
30=5*3*2

11*2*5*3 = 330 miles

330 miles= 22mpg *x gallons
x=15

330 miles = 30 mpg *y gallons
y= 11

11 gallons+15 gallons=26 total gallons spent

330 miles ahead and back = 660 miles

660/26= 25.38

the answer is B
Most Helpful Community Reply
avatar
ruposh6240
Intern
Intern
Joined: 22 Jul 2018
Posts: 39
Own Kudos [?]: 67 [7]
Given Kudos: 0
Send PM
Re: While driving from city A to city B, a car got 22 miles per [#permalink] New post   15 Oct 2018, 11:04
7
22 miles need 1 gallon, therefore, 1 mile needs 1//22 for A to B. Similarly, 1/30 for B to A.
1+1= 2 miles need (1/20 +1/30) = 52/660 gallons
Now, 52/660 gallons need 2 miles for entire journey
Therefore, 1 gallons need= (2*660)/52 = 25.38
so, Answer is B
General Discussion
avatar
chetan2u
Supreme Moderator
Joined: 01 Nov 2017
Posts: 371
Own Kudos [?]: 470 [2]
Given Kudos: 0
Send PM
Re: While driving from city A to city B, a car got 22 miles per [#permalink] New post   14 Jan 2019, 00:33
2
Expert Reply
sandy wrote:
While driving from city A to city B, a car got 22 miles per gallon and while returning on the same road, the car got 30 miles per gallon.

Quantity A
Quantity B
The car’s average gas mileage for the entire trip, in miles per gallon
\(26\)


A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.



50% wrong means that most are straightway taking the average of two mileages

That is going to be wrong, as it will be wrong for average speed question too..

When you are travelling same distance in two different speeds or different mileage, the average of total will always be LESS than the arithmetic mean of the two

so here B is the mean, so will be greater than A..

The best way would be to take the LCM of two speeds or mileage as the distance one way as also shown above by Happymathtutor.

so LCM of 22 and 30 is 330...
1) fuel used while going = 330/22=15
2) fuel used while returning = 330/30=11

distance = 330+330=660
fuel used = 15+11=26
Average = 660/26 = 25.38 <26
hence B>A
avatar
Naveen542
Intern
Intern
Joined: 10 Apr 2021
Posts: 5
Own Kudos [?]: 3 [3]
Given Kudos: 1
Send PM
Re: While driving from city A to city B, a car got 22 miles per [#permalink] New post   21 May 2021, 18:43
2
1
Bookmarks
There is a simple formula we can use i.e. 2ab/a+b
avatar
B
lucifer6251
Intern
Intern
Joined: 01 Sep 2021
Posts: 36
Own Kudos [?]: 34 [1]
Given Kudos: 77
Send PM
Re: While driving from city A to city B, a car got 22 miles per [#permalink] New post   10 Sep 2021, 04:31
1
2*22*30 / (22+30) = 25.38 < B
avatar
kairapotato
Intern
Intern
Joined: 20 Jul 2021
Posts: 3
Own Kudos [?]: 2 [1]
Given Kudos: 7
Send PM
Re: While driving from city A to city B, a car got 22 miles per [#permalink] New post   07 Oct 2021, 04:42
1
Naveen542 wrote:
There is a simple formula we can use i.e. 2ab/a+b


Can you explain a bit more? Where does this formula come from?
User avatar
D
Carcass
Verbal Expert
Joined: 18 Apr 2015
Posts: 30017
Own Kudos [?]: 36368 [1]
Given Kudos: 25928
Send PM
Re: While driving from city A to city B, a car got 22 miles per [#permalink] New post   07 Oct 2021, 05:47
1
Expert Reply
kairapotato wrote:
Naveen542 wrote:
There is a simple formula we can use i.e. 2ab/a+b


Can you explain a bit more? Where does this formula come from?

\\It is explained in our book

Please refer to it https://gre.myprepclub.com/forum/gre-quant ... tml#p52437

We have all the resources for the GRE
avatar
B
SyedNusratShah
Intern
Intern
Joined: 09 Nov 2021
Posts: 11
Own Kudos [?]: 3 [0]
Given Kudos: 0
Send PM
Re: While driving from city A to city B, a car got 22 miles per [#permalink] New post   25 Jan 2022, 11:19
Carcass wrote:
kairapotato wrote:
Naveen542 wrote:
There is a simple formula we can use i.e. 2ab/a+b


Can you explain a bit more? Where does this formula come from?

\\It is explained in our book


We have all the resources for the GRE


Can you send me the actual snip of location, where it is found in GRE book, I can not find. Thankyou.

Posted from my mobile device
User avatar
D
Carcass
Verbal Expert
Joined: 18 Apr 2015
Posts: 30017
Own Kudos [?]: 36368 [0]
Given Kudos: 25928
Send PM
Re: While driving from city A to city B, a car got 22 miles per [#permalink] New post   25 Jan 2022, 11:22
Expert Reply
Do you mean the distance rate formula ?
avatar
B
SyedNusratShah
Intern
Intern
Joined: 09 Nov 2021
Posts: 11
Own Kudos [?]: 3 [0]
Given Kudos: 0
Send PM
Re: While driving from city A to city B, a car got 22 miles per [#permalink] New post   25 Jan 2022, 11:25
I mean this, 2ab/a+b formula. where I can find the details of this?

Posted from my mobile device
User avatar
D
Carcass
Verbal Expert
Joined: 18 Apr 2015
Posts: 30017
Own Kudos [?]: 36368 [0]
Given Kudos: 25928
Send PM
Re: While driving from city A to city B, a car got 22 miles per [#permalink] New post   25 Jan 2022, 11:40
Expert Reply
SyedNusratShah wrote:
I mean this, 2ab/a+b formula. where I can find the details of this?

Posted from my mobile device


frankly I do not know Sir. That formula is best for work/rate problems when you combine the work.

here is a distance rate problem which, yes, is under the same umbrella but slightly different

Look here more on work rate problems https://gre.myprepclub.com/forum/gre-work- ... 24921.html

here more on the distance rate problems https://gre.myprepclub.com/forum/gre-time- ... 24922.html
User avatar
bumpbot
GRE Prep Club Legend
GRE Prep Club Legend
Joined: 07 Jan 2021
Posts: 5043
Own Kudos [?]: 74 [0]
Given Kudos: 0
Send PM
Re: While driving from city A to city B, a car got 22 miles per [#permalink] New post   16 Aug 2024, 02:10
Hello from the GRE Prep Club BumpBot!

Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Prep Club for GRE Bot
gmatclubot
Re: While driving from city A to city B, a car got 22 miles per [#permalink]
16 Aug 2024, 02:10
Moderators:
adewale223
GRE Instructor
84 posts
bronaugust
GRE Forum Moderator
37 posts
BrushMyQuant
Moderator
1111 posts
VibhuAnurag
GRE Instructor
234 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Main navigation

Partners

GRE Resources

www.ets.org/gre | About | Terms and Conditions and Privacy Policy | Prep Club for GRE Rules | Contact