Last visit was: 22 Dec 2024, 16:43 It is currently 22 Dec 2024, 16:43

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
avatar
Intern
Intern
Joined: 22 Aug 2018
Posts: 29
Own Kudos [?]: 69 [0]
Given Kudos: 0
Send PM
avatar
Intern
Intern
Joined: 22 Aug 2018
Posts: 29
Own Kudos [?]: 69 [0]
Given Kudos: 0
Send PM
Verbal Expert
Joined: 18 Apr 2015
Posts: 30475
Own Kudos [?]: 36821 [0]
Given Kudos: 26100
Send PM
avatar
Intern
Intern
Joined: 22 Aug 2018
Posts: 29
Own Kudos [?]: 69 [0]
Given Kudos: 0
Send PM
Re: a+d or b+c [#permalink]
Carcass wrote:
Actually \(\frac{a}{b}=\frac{3}{7}\) AND \(\frac{c}{d}=\frac{3}{7}\)

In the first one, a is a multiple of 7 and b of 3

In the second one, c is a multiple of 7 and d of 3.

Now, a=14 and d=6 and which in QA is 21

Then, c=21 and d= 9 so in QB is 30 So the answer is B.

However, a =35 and d=15 and QA is 50

c=7 and d = 3 and QB is 10 So the answer is A. Not sufficient information to have a clear and definitive answer.

The OA is D.

Hope this helps



I am confused. You seem to have erroneously typed d multiple times. Also, I have a doubt that why 14 and 6, like why can't it be different multiples of numbers?
Verbal Expert
Joined: 18 Apr 2015
Posts: 30475
Own Kudos [?]: 36821 [0]
Given Kudos: 26100
Send PM
Re: a+d or b+c [#permalink]
Expert Reply
Yes, sorry in the second disprove statement is not d=15 but b=15. Just typo.

As for your doubt, yes they can be whichever multiple you wanna pick. Mine were just a few examples.

I.E. a/b=3/7 cross multiply and 7a=3b

a is a multiple of 7 and b is a multiple of 3.

Ask for further assistance
avatar
Intern
Intern
Joined: 22 Aug 2018
Posts: 29
Own Kudos [?]: 69 [0]
Given Kudos: 0
Send PM
Re: a+d or b+c [#permalink]
Carcass wrote:
Yes, sorry in the second disprove statement is not d=15 but b=15. Just typo.

As for your doubt, yes they can be whichever multiple you wanna pick. Mine were just a few examples.

I.E. a/b=3/7 cross multiply and 7a=3b

a is a multiple of 7 and b is a multiple of 3.

Ask for further assistance


So in solving I have to take the same multiples of each other?
Like 7*2 and 3*2
or 7*25 and 3*25
or both can be different, larger or smaller?
Verbal Expert
Joined: 18 Apr 2015
Posts: 30475
Own Kudos [?]: 36821 [0]
Given Kudos: 26100
Send PM
Re: a+d or b+c [#permalink]
Expert Reply
Multiple of 7a are

7/14/21/28/35.......................

Multiple factors can be also technically negative. However, for the GRE purpose they are considered only positive.

This concept is mentioned in the ETS GRE Math Conventions PDF https://www.ets.org/s/gre/pdf/gre_math_conventions.pdf

Regards
avatar
Intern
Intern
Joined: 07 Sep 2018
Posts: 5
Own Kudos [?]: 12 [0]
Given Kudos: 0
Location: United States
GRE 1: Q169 V170
Send PM
Re: a+d or b+c [#permalink]
1
In this kind of questions, you could just give them a value. If a b; c d are 3 7; 3 7respectively ,then Qa and Qb are equal. But if they 3 7;6 14 respectively,Qa and Qb are not equal. Then the answer must be D.
Prep Club for GRE Bot
Re: a+d or b+c [#permalink]
Moderators:
GRE Instructor
88 posts
GRE Forum Moderator
37 posts
Moderator
1115 posts
GRE Instructor
234 posts

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