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50 marbles

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by dxgamez » Wed Apr 07, 2010 5:52 pm
Brian is dividing 50 marbles into 3 groups. How many marbles are in the largest of the 3 groups?

1. The sum of the 2 smaller groups of marbles is equal to the largest group of marbles
2. The smallest group contains 6 marbles

Source:- TestPrepReview.com

OA: A
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Source: — Data Sufficiency |
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by thephoenix » Wed Apr 07, 2010 7:06 pm
let three groups be x,y and z each containing a,b and c marbles repectively and z is the largest group

s1) a+b=c
a+b+c=50(from question stem)
c+c=50(from s1)--->c=25
suff

s2) a=6 we dont know b and c insuff
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by dxgamez » Wed Apr 07, 2010 7:13 pm
thanks for explaining st1. that's much clearer for me!
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by gmatmachoman » Wed Apr 07, 2010 7:37 pm
thephoenix wrote:let three groups be x,y and z each containing a,b and c marbles repectively and z is the largest group

s1) a+b=c
a+b+c=50(from question stem)
c+c=50(from s1)--->c=25
suff

s2) a=6 we dont know b and c insuff
@pheonix bhai,

what if they would have asked ,find the numbers in each group???

So will u use both??
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by thephoenix » Wed Apr 07, 2010 8:51 pm
gmatmachoman wrote:@pheonix bhai,

what if they would have asked ,find the numbers in each group???

So will u use both??
yes def. since s1 gives the value of only one group and the sum of other two group , we need further information reagrading at least one of the other two.
which in this case is done by s2
so in that case C wud have been the ans
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