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Camping trip

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Senior | Next Rank: 100 Posts
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GMAT Score:600
by fightthegmat » Thu Sep 10, 2009 9:11 pm
On a camping trip, x campers each paid y dollars for food.What percent of the total food expenses did each camper pay?
1.If there were one fewer camper,each camper would owe 1 dollar more.
2.If there were half as many campers,each camper would owe 7 dollars more.

Could you pls help with this?
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Source: — Data Sufficiency |
Master | Next Rank: 500 Posts
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Is it B?

by enniguy » Thu Sep 10, 2009 10:49 pm
Is the answer B? Please post the OA. If it's right, I will post my method.

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Newbie | Next Rank: 10 Posts
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by sanity » Thu Sep 10, 2009 11:06 pm
we need the value of both x and y to answer this question
Cond1
(x-1)(y+1)=xy
1 eq 2 variables not possible to know x and y
Cond2
x/2(y+7)=xy
One eq 2 variable again
impossible
Combining both.
2 eq 2 variables very much possible.
Ans c
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