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Source: — Data Sufficiency |
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by selango » Sun Sep 19, 2010 9:11 am
Price of each sandwich=x

Price of each soda=y

2x+3y=?


stmt1,

x+y=3

There can be many values possible for x and y.

Insuff

stmt2,

3x+2y=8

There can be many values possible for x and y.

Insuff

combining 1 and 2,

x+y=3

3x+2y=8

From above 2 equations,we can solve x and y.

Suff

Pick C
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by tpr-becky » Sun Sep 19, 2010 8:01 pm
This is a typical two equations two variable question - you are asked for the value of a formula involving the price of 2 sandwiches and 1 soda.

1) give you a formula for 1 of each but this can't be manipulated to look like our original formul and it has two varibles wiht only one equation. Therefore it is insufficient. BCE

2) Similar to above, can't be manipulated to look like our stem formula and has two variables so it is insufficient. CE

together you have two equations and two variables, the equations are not multiples and do not contain exponents. Therefore they will be enough to solve and your answer is C.
Becky
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by Gurpinder » Mon Sep 20, 2010 6:25 am
Thank you both :)
"Do not confuse motion and progress. A rocking horse keeps moving but does not make any progress."
- Alfred A. Montapert, Philosopher.
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