from the practice book.

" If R*a=a*(4/5), then R=

A)2/3
B)4/5
C)1
D)5/4
E)Cannot be determined.

"
Shit blew my mind.
Yall take a stab at it. Ill come back with the answer.

[Edited on May 9, 2014 at 11:09 AM. Reason : .]

5/9/2014 11:07:45 AM

easy

5/9/2014 11:37:12 AM

well...this is awkward.

http://www.wolframalpha.com/input/?i=R*a%3Da*%284%2F5%29%2C+solve+R

5/9/2014 12:12:23 PM

assuming the question is as you stated and nothing more, i already posted the answer

5/9/2014 12:42:31 PM

are you two serious?

5/9/2014 1:12:02 PM

i am very serious

5/9/2014 1:25:11 PM

I know and do see that. But why Wolfram did not Note any assumption is quite careless.

5/9/2014 2:08:14 PM

^ yeah, pretty surprised too.

they made up their own assumption that a != 0.

remember, 0 is always a legit value for any variable, unless otherwise indicated.

i love gre/sat questions... if you have more where you are confused, please do post, i demolished the gre

5/9/2014 2:48:51 PM