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Question Stats:
66% (00:53) correct
33% (00:26) wrong based on 21 sessions
\(\frac{a}{b} = \frac{3}{7} = \frac{c}{d}\)
Quantity A 
Quantity B 
\(a+d\) 
\(b+c\) 
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.
Last edited by Carcass on 06 Sep 2018, 02:13, edited 1 time in total.
Edited by Carcass




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Anyone?



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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 b=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
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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?



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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
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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?



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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.pdfRegards
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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.









