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10 Aug 2009, 16:45
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Bookmarks
I ran across this problem in a Manhattan GMAT CAT:
What is the ratio of x to y?
(1) 5x = 2y
(2) 2y = 7x – 8
MGMAT says A is sufficient. However, that automatically assumes that Y does not equal to 0, which is not stated anywhere. If Y = 0, then x/y would be undefined. Is this an error or have I completely lost my mind?
What is the ratio of x to y?
(1) 5x = 2y
(2) 2y = 7x – 8
MGMAT says A is sufficient. However, that automatically assumes that Y does not equal to 0, which is not stated anywhere. If Y = 0, then x/y would be undefined. Is this an error or have I completely lost my mind?
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11 Aug 2009, 06:47
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What is the ratio of x to y?
(1) 5x = 2y
(2) 2y = 7x – 8
ST1:
5x = 2y
=> Either x/y = 0/0 = Undefined OR x/y = 0.4
=> NOT SUFFICIENT
ST2:
2y = 7x – 8
=> NOT SUFFICIENT
ST1 & ST2 Together:
Solving 5x = 2y & 2y = 7x – 8 we conclude that x = y = 0 is not a solution.
=> x/y = 0.4
=> SUFFICIENT
ANS: C
(1) 5x = 2y
(2) 2y = 7x – 8
ST1:
5x = 2y
=> Either x/y = 0/0 = Undefined OR x/y = 0.4
=> NOT SUFFICIENT
ST2:
2y = 7x – 8
=> NOT SUFFICIENT
ST1 & ST2 Together:
Solving 5x = 2y & 2y = 7x – 8 we conclude that x = y = 0 is not a solution.
=> x/y = 0.4
=> SUFFICIENT
ANS: C
11 Aug 2009, 07:05
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samrus98
Yeah that's the exact way I did it and I was fairly certain that this was a very low level problem so I was shocked to see that Manhattan GMAT's answer was A.
