Last visit was: 25 Nov 2024, 15:10 It is currently 25 Nov 2024, 15:10

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.

Close

Request Expert Reply

Confirm Cancel
Verbal Expert
Joined: 18 Apr 2015
Posts: 30024
Own Kudos [?]: 36397 [0]
Given Kudos: 25929
Send PM
Verbal Expert
Joined: 18 Apr 2015
Posts: 30024
Own Kudos [?]: 36397 [0]
Given Kudos: 25929
Send PM
avatar
Intern
Intern
Joined: 08 May 2020
Posts: 15
Own Kudos [?]: 19 [0]
Given Kudos: 0
Send PM
avatar
Intern
Intern
Joined: 23 Jan 2020
Posts: 18
Own Kudos [?]: 31 [0]
Given Kudos: 0
Send PM
Re: Working alone, Navid can mow [#permalink]
3
I went with the easy cumulative work formula (A + B) / (A * B)

for Quantity A: Navid + Steven = (2 + 12) / (2 * 12) = 14/24 = 7/12
for Quantity B: Erin + Janey = (3 + 4) / (3 * 4) = 7/12

answer C
avatar
Intern
Intern
Joined: 15 Mar 2020
Posts: 24
Own Kudos [?]: 31 [0]
Given Kudos: 0
Send PM
Re: Working alone, Navid can mow [#permalink]
1
There is no need to remember a special formula.
Just this one: S = t*V (v - velocity as units per hour, t - time, S - units done)
N = 2h => V = 1/2
E = 3h => V = 1/3
S = 12h => V = 1/12
J = 4h => V = 1/4
S = 1 (1 - field) => 1 = t (1/2+1/12) => t=7/12
S = 1 => 1 = t(1/3 + 1/4) => t=7/12
The same
avatar
Manager
Manager
Joined: 19 Mar 2018
Posts: 64
Own Kudos [?]: 37 [0]
Given Kudos: 0
Send PM
Re: Working alone, Navid can mow [#permalink]
1
lets look at the rates: 1/2 , 1/3, 1/4, 1/12 (assuming they are all working for one unit of work)

Thus 1/2 + 1/12 = 7/12
And 1/3 + 1/4 = 7 /12
Ans C

Kudos if you like this post!
Prep Club for GRE Bot
Re: Working alone, Navid can mow [#permalink]
Moderators:
GRE Instructor
84 posts
GRE Forum Moderator
37 posts
Moderator
1111 posts
GRE Instructor
234 posts

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