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25 Oct 2012, 21:09
Kudos
Bookmarks
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
62% (01:47) correct
38%
(01:50)
wrong
based on 216
sessions
History
Date
Time
Result
Not Attempted Yet
Does s = 5 - t ?
(1) t = 17 - 4s
(2) s = 8 - 4t
I answered correctly but it wasn't really sure of answer process. I converted s + t = 5.
Each of (1) or (2) seemingly could not answer alone. So I combined the statements and
s + t = clearly something that is not 5.
But it decisively answers the question (i.e. NO, it does NOT).
So I arrive at the answer...
Is that the way to answer it?
Thanks for your help.
(1) t = 17 - 4s
(2) s = 8 - 4t
I answered correctly but it wasn't really sure of answer process. I converted s + t = 5.
Each of (1) or (2) seemingly could not answer alone. So I combined the statements and
s + t = clearly something that is not 5.
But it decisively answers the question (i.e. NO, it does NOT).
So I arrive at the answer...
Is that the way to answer it?
Thanks for your help.
25 Oct 2012, 21:46
Kudos
Bookmarks
Hey elegan,
Question is about does s + t = 5 ?
if you get answer yes or no from a statement then that is enough.
you don't need to prove s + t =5
combined 1 & 2
if statemnt is giving s+ t = 5 then 'YES' that means statment is enough to answer your question.
and if statement s + t not equal to 5 or any other number then statement is enough because it is giving
answer to your question i.e. 'NO'
Hope you cleared
Question is about does s + t = 5 ?
if you get answer yes or no from a statement then that is enough.
you don't need to prove s + t =5
combined 1 & 2
if statemnt is giving s+ t = 5 then 'YES' that means statment is enough to answer your question.
and if statement s + t not equal to 5 or any other number then statement is enough because it is giving
answer to your question i.e. 'NO'
Hope you cleared
25 Oct 2012, 22:08
Kudos
Bookmarks
elegan
The question is:
Is s + t = 5?
Statement (1) t = 17 - 4s
4s + t = 17 ........(I)
This statement alone is not enough. You don't know what s + t is.
Statement (2) s = 8 - 4t
s + 4t = 8 ...........(II)
Again, this statement alone is not enough. You don't know what s + t is.
Using both, you can solve the equations simultaneously. Add (I) and (II)
4s + t = 17
s + 4t = 8
--------------
5s + 5t = 25
s + t = 5
From both the statements, you get that s + t is actually equal to 5. Your answer is 'Yes'.
So (C)
If you had obtained s + t = something other than 5 using both the statements, you would still have obtained a decisive 'No' to the question. Hence your answer would still have been (C)
