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At a certain bakery, each roll costs r cents and each

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At a certain bakery, each roll costs r cents and each [#permalink] New post 18 Dec 2005, 18:08
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At a certain bakery, each roll costs r cents and each doughnut costs d cents. If Alfredo bought rolls and doughnuts at the bakery, how many cents did he pay for each roll?

1) Alfredo paid $5.00 for 8 rolls and 6 doughnuts

2) Alfredo would have paid $ 10.00 if he had bought 16 rolls and 12 doughnuts
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typical GMAT Trap. [#permalink] New post 18 Dec 2005, 18:11
This is a typical GMAT trap. YOu might have seen my earlier post about picking numbers for DS. In general, two equations in two unknowns can be solved to get a unique (one) solution except when the two equations are the same. If you divide the information in statement 2, you get statemetn 1. So, statemetn 2 is not giving you any new information. Hence, the answer should be E.

-Srinivas (mathguru).
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 [#permalink] New post 18 Dec 2005, 19:28
The oa is E

thanks srinivasssrk, i fell for it.
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 [#permalink] New post 18 Dec 2005, 20:28
Yup answer is E.

(1) and (2) are the same thing
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 [#permalink] New post 18 Dec 2005, 20:35
TeHCM wrote:
Yup answer is E.

(1) and (2) are the same thing


For once, I get the right answer.. :-D
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Re: DS Equations [#permalink] New post 19 Dec 2005, 01:51
joemama142000 wrote:
At a certain bakery, each roll costs r cents and each doughnut costs d cents. If Alfredo bought rolls and doughnuts at the bakery, how many cents did he pay for each roll?

1) Alfredo paid $5.00 for 8 rolls and 6 doughnuts

2) Alfredo would have paid $ 10.00 if he had bought 16 rolls and 12 doughnuts


From stmt1 we get 8r+6d = 5
From stmt2 we get 16r + 12d = 10

Stmt1 * 2 = stmt 2, and we will not be able to solve this equen. So my answer is E.
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 [#permalink] New post 19 Dec 2005, 11:44
Similar Equations , hence 1 equation , 2 variables .... E
  [#permalink] 19 Dec 2005, 11:44
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