Last visit was: 31 Aug 2026, 20:20 It is currently 31 Aug 2026, 20:20
Home
Messages
Tests
Schools
Events
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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
Back to Forum
Create Topic
User avatar
Sajjad1994
User avatar
GRE Forum Moderator
Joined: 02 Nov 2016
Last visit: 31 Aug 2026
Posts: 16,386
Own Kudos:
53,581
 [5]
Given Kudos: 6,456
GPA: 3.62
Products:
GMAT Club Tests Forum Quiz
Posts: 16,386
Kudos: 53,581
 [5]
In a 5-hour race, 6 cars consumed 480 gallons of gas between them. Ass 10 May 2017, 12:17
3
Kudos
Add Kudos
2
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

5% (low)

Question Stats:

87% (01:41) correct 13% (02:32) wrong based on 146 sessions

History

Date
Time
Result
Not Attempted Yet
In a 5-hour race, 6 cars consumed 480 gallons of gas between them. Assuming a constant rate of consumption, how much gas would be consumed by 7 cars in an 8-hour race?

A. 560
B. 654.5
C. 768
D. 864
E. 896
ShowHide Answer
Official Answer
E
avatar
gmathopeful19
avatar
Joined: 09 Oct 2016
Last visit: 27 Jun 2018
Posts: 65
Own Kudos:
35
 [2]
Given Kudos: 8
Location: United States
Schools: Kellogg '20 (A)  (A$) Tuck '20 (WL) Duke '20 (I)
GMAT 1: 740 Q49 V42
GPA: 3.49
Products:
My Reviews
Schools: Kellogg '20 (A)  (A$) Tuck '20 (WL) Duke '20 (I)
GMAT 1: 740 Q49 V42
Posts: 65
Kudos: 35
 [2]
In a 5-hour race, 6 cars consumed 480 gallons of gas between them. Ass 10 May 2017, 12:22
2
Kudos
Add Kudos
Bookmarks
Bookmark this Post
E.

6(x)*5= 480

X = 16

Plug in and get 896

Posted from my mobile device
User avatar
generis
User avatar
Senior SC Moderator
Joined: 22 May 2016
Last visit: 18 Jun 2022
Posts: 5,255
Own Kudos:
37,998
 [1]
Given Kudos: 9,464
Expert
Expert reply
Posts: 5,255
Kudos: 37,998
 [1]
In a 5-hour race, 6 cars consumed 480 gallons of gas between them. Ass 10 May 2017, 13:30
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
SajjadAhmad
In a 5-hour race, 6 cars consumed 480 gallons of gas between them. Assuming a constant rate of consumption, how much gas would be consumed by 7 cars in an 8-hour race?

A. 560
B. 654.5
C. 768
D. 864
E. 896
Show more
I suspect this method may be a slightly unorthodox, but I often set up equations wrong on rate questions, so I drew a table:
Attachment:
CONSUMPTION - RATE - TABLE.jpg
CONSUMPTION - RATE - TABLE.jpg [ 35.95 KiB | Viewed 3777 times ]

Because this is a rate question that resembles the "multiple workers" at unknown individual rate (where total work is analogous to total number of gallons consumed, as in pool-draining rate questions), I drew a table.

TOTAL gallons consumed / [total # of cars * total hrs gas is consumed] = RATE of individual car's consumption (see second column)

\(\frac{480}{6*5}\)= \(\frac{480}{30}\) = 16 gallons of gas per hour for INDIVIDUAL car

Now we have individual rate of consumption, such that (# of cars)*(rate of consumption)*(hours spent consuming) = TOTAL gallons consumed (see second row)

7*16*8 = 896
Answer E

I hope this method isn't incorrect. SajjadAhmad ?
User avatar
gracie
User avatar
Joined: 07 Dec 2014
Last visit: 11 Oct 2020
Posts: 1,022
Own Kudos:
2,101
Given Kudos: 27
Posts: 1,022
Kudos: 2,101
In a 5-hour race, 6 cars consumed 480 gallons of gas between them. Ass 10 May 2017, 14:05
Kudos
Add Kudos
Bookmarks
Bookmark this Post
SajjadAhmad
In a 5-hour race, 6 cars consumed 480 gallons of gas between them. Assuming a constant rate of consumption, how much gas would be consumed by 7 cars in an 8-hour race?

A. 560
B. 654.5
C. 768
D. 864
E. 896
Show more

480/(6*5)=16 gallons per car per hour
16*7*8=896 gallons
E
User avatar
pushpitkc
User avatar
Joined: 26 Feb 2016
Last visit: 19 Feb 2025
Posts: 2,794
Own Kudos:
6,341
Given Kudos: 47
Location: India
GPA: 3.12
Posts: 2,794
Kudos: 6,341
In a 5-hour race, 6 cars consumed 480 gallons of gas between them. Ass 10 May 2017, 14:12
Kudos
Add Kudos
Bookmarks
Bookmark this Post
30(5 cars*6 hours) car hours consumes 480 gallons of fuel.
We need to find how much 56 car hour consume? (7 cars * 8 hours)

30 ---- 480
56 ---- x

Cross multiplying and solving for x,
30x = 480*56
x = 16*56 = 896(Option E)
User avatar
JeffTargetTestPrep
User avatar
Target Test Prep Representative
Joined: 04 Mar 2011
Last visit: 05 Jan 2024
Posts: 2,973
Own Kudos:
8,944
 [1]
Given Kudos: 1,646
Status:Head GMAT Instructor
Affiliations: Target Test Prep
Expert
Expert reply
Posts: 2,973
Kudos: 8,944
 [1]
In a 5-hour race, 6 cars consumed 480 gallons of gas between them. Ass 15 May 2017, 17:32
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
SajjadAhmad
In a 5-hour race, 6 cars consumed 480 gallons of gas between them. Assuming a constant rate of consumption, how much gas would be consumed by 7 cars in an 8-hour race?

A. 560
B. 654.5
C. 768
D. 864
E. 896
Show more

Since 6 cars consume 480 gallons, one car consumes 480/6 = 80 gallons in 5 hours. Thus, the consumption rate for each car is 80/5 = 16 gallons per hour.

Since there are 7 cars, they will consume a total of 16 x 7 = 112 gallons per hour. Since the race takes 8 hours, all 7 cars will consume 112 x 8 = 896 gallons of gas.

Answer: E
User avatar
bumpbot
User avatar
Non-Human User
Joined: 09 Sep 2013
Last visit: 04 Jan 2021
Posts: 39,211
Own Kudos:
1,156
Posts: 39,211
Kudos: 1,156
In a 5-hour race, 6 cars consumed 480 gallons of gas between them. Ass 14 Aug 2026, 10:32
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Automated notice from GMAT Club BumpBot:

A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.

This post was generated automatically.
Moderator:
Bunuel
Math Expert
113036 posts