Last visit was: 11 Jul 2025, 15:21 It is currently 11 Jul 2025, 15:21
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.
Close
Request Expert Reply
Confirm Cancel
User avatar
HolaMaven
Joined: 12 Aug 2017
Last visit: 06 Mar 2021
Posts: 60
Own Kudos:
134
 [14]
Given Kudos: 13
Status:Math Tutor
GMAT 1: 750 Q50 V42
WE:Education (Education)
GMAT 1: 750 Q50 V42
Posts: 60
Kudos: 134
 [14]
Kudos
Add Kudos
14
Bookmarks
Bookmark this Post
User avatar
HolaMaven
Joined: 12 Aug 2017
Last visit: 06 Mar 2021
Posts: 60
Own Kudos:
134
 [2]
Given Kudos: 13
Status:Math Tutor
GMAT 1: 750 Q50 V42
WE:Education (Education)
GMAT 1: 750 Q50 V42
Posts: 60
Kudos: 134
 [2]
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
User avatar
pushkarajnjadhav
Joined: 12 Feb 2017
Last visit: 30 Nov 2020
Posts: 59
Own Kudos:
88
 [1]
Given Kudos: 48
Posts: 59
Kudos: 88
 [1]
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
User avatar
generis
User avatar
Senior SC Moderator
Joined: 22 May 2016
Last visit: 18 Jun 2022
Posts: 5,293
Own Kudos:
36,932
 [1]
Given Kudos: 9,464
Products:
Expert
Expert reply
Posts: 5,293
Kudos: 36,932
 [1]
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
HolaMaven
Mary takes 15 minutes to eat a plate of french fries. Ann takes 30 minutes to eat a plate of french fries. If Mary and Ann decide to eat fries, from the plate, each for a minute alternatively starting with Mary, how long will it take them to finish the plate, if each eats the french fries at her respective rate?
a. 8 mins
b. 10 mins
c. 18 mins
d. 20 mins
e. 45 mins
Use 30 fries (or any reasonable multiple of 15 and 30) to find out how many fries per minute each person eats. 1 plate, P = 30 fries. Substitute 30 fries, F, for 1 plate, P.

Mary = \(\frac{1P}{15min}\) = \(\frac{30F}{15min}\). Reduce.

M's rate = \(\frac{2F}{1min}\)

A's rate: \(\frac{1}{30}\) = \(\frac{30F}{30min}\) = \(\frac{1F}{1min}\)

There are 30 fries. Mary eats two fries in one minute. Ann eats one fry in 1 minute. But they don't eat during the same minute.

First minute: Mary eats two fries

Next minute: Ann eats one fry

So after two minutes, they have eaten 3 fries. How long will it take them to eat 30 fries?

\(\frac{3F}{2 min} = \frac{30F}{X mins}\)

3x = 60
x = 20 minutes

Answer D
User avatar
Kinshook
User avatar
Major Poster
Joined: 03 Jun 2019
Last visit: 11 Jul 2025
Posts: 5,696
Own Kudos:
5,212
 [1]
Given Kudos: 161
Location: India
GMAT 1: 690 Q50 V34
WE:Engineering (Transportation)
Products:
GMAT 1: 690 Q50 V34
Posts: 5,696
Kudos: 5,212
 [1]
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
HolaMaven
Mary takes 15 minutes to eat a plate of french fries. Ann takes 30 minutes to eat a plate of french fries. If Mary and Ann decide to eat fries, from the plate, each for a minute alternatively starting with Mary, how long will it take them to finish the plate, if each eats the french fries at her respective rate?
a. 8 mins
b. 10 mins
c. 18 mins
d. 20 mins
e. 45 mins

Marty eats 1/15 of a plate in a minute
Ann eats 1/30 of a plate in a minute

1/15 + 1/30 + 1/15 + 1/30 + ......... = 1
1/15 + 1/30 = 1/10 in 2 minutes
10* 1/10 in 2 * 10 minutes
=20 minutes

IMO D
User avatar
bumpbot
User avatar
Non-Human User
Joined: 09 Sep 2013
Last visit: 04 Jan 2021
Posts: 37,375
Own Kudos:
Posts: 37,375
Kudos: 1,010
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Hello from the GMAT Club BumpBot!

Thanks to another GMAT 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.
Moderators:
Math Expert
102635 posts
PS Forum Moderator
688 posts