I think it should be A
We need to know if r/(b+w+r)>w/(b+w+r)?
that is r^2+rb+rw>wb+w^2+wr (cross multiply the denominators)
or in short r^2+rb>wb+w^2?
St 1: r/(b+w) > w/(b+r)
Cross multiply the denominator you'll get
rb+r^2>w^2+wb----SUFF
St 2: b -w > r
Not suff to prove if r^2+rb>wb+w^2 since we dont know if r>w or not. INSUFF.
Logitech DS Set 2
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Source: Beat The GMAT — Data Sufficiency |
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logitech
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@ mals24"
Text book explanation.
This was actually my first question in the GMAT prep test and I spent a good amount of time ( HORRIBLE IDEA ) to make sure that the answer is A but not D.
Folks,
Be prepered to hit by a tough question as a first question. This is like a good first second punch when a boxing game starts. Try not to be knocked out..you still have 36 more rounds!!
Greay approach to solve a DS...Simply what question is really asking!or in short r^2+rb>wb+w^2?
Text book explanation.
This was actually my first question in the GMAT prep test and I spent a good amount of time ( HORRIBLE IDEA ) to make sure that the answer is A but not D.
Folks,
Be prepered to hit by a tough question as a first question. This is like a good first second punch when a boxing game starts. Try not to be knocked out..you still have 36 more rounds!!
LGTCH
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"DON'T LET ANYONE STEAL YOUR DREAM!"
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"DON'T LET ANYONE STEAL YOUR DREAM!"
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logitech
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I know...The software is more clever than I thought It was..But Cramya, seriously it happened to me before. You start a test with a toughy and you need to stay strong. I always remeber Stacey's tennis game explanation. Sometimes GMAT can score a good point we should say..good point and move on.cramya wrote:Probably gmat prep knew u were taking it; no?Be prepered to hit by a tough question as a first question
LGTCH
---------------------
"DON'T LET ANYONE STEAL YOUR DREAM!"
---------------------
"DON'T LET ANYONE STEAL YOUR DREAM!"
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cramya
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I know...The software is more clever than I thought It was..But Cramya, seriously it happened to me before. You start a test with a toughy and you need to stay strong. I always remeber Stacey's tennis game explanation. Sometimes GMAT can score a good point we should say..good point and move on.
I dont doubt u a bit. I was just pulling your leg for funsake...
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720dreaming
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Wow, thats quite a tricky first Question!
Since, its all positive number, we can cross multiply to get A and then for B I just tested out some numbers to prove B can be ambiguous.
Now, how about the same question (not marbles, but just any numbers), if we DONT KNOW that all the numbers are positive...
Since, its all positive number, we can cross multiply to get A and then for B I just tested out some numbers to prove B can be ambiguous.
Now, how about the same question (not marbles, but just any numbers), if we DONT KNOW that all the numbers are positive...
