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A batch of cookies was divided amomg 3 tins: 2/3 of all the [#permalink]

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11 Nov 2009, 07:42

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A batch of cookies was divided amomg 3 tins: 2/3 of all the cookies were placed in either the blue or the green tin, and the rest were placed in the red tin. If 1/4 of all the cookies were placed in the blue tin, what fraction of the cookies that were placed in the other tins were placed in the green tin

A batch of cookies was divided amomg 3 tins: 2/3 of all the cookies were placed in either the blue or the green tin, and the rest were placed in the red tin. If 1/4 of all the cookies were placed in the blue tin, what fraction of the cookies that were placed in the other tins were placed in the green tin

A. 15/2 B. 9/4 C. 5/9 D. 7/5 E. 9/7

# of cookies - X

2/3 of all the cookies were placed in either the blue or the green tin: \(B+G=\frac{2}{3}*X\) The rest were placed in the red tin: \(R=\frac{1}{3}*X\) 1/4 of all the cookies were placed in the blue tin: \(B=\frac{1}{4}*X\).

What fraction of the cookies that were placed in the other tins (other then blue, or in Green and Red) were placed in the green tin: \(\frac{G}{G+R}=?\)

\(B+G=\frac{2}{3}*X\) and \(B=\frac{1}{4}*X\); --> \(\frac{1}{4}*X+G=\frac{2}{3}*X\); --> \(G=\frac{5}{12}*X\).

A batch of cookies was divided amomg 3 tins: 2/3 of all the cookies were placed in either the blue or the green tin, and the rest were placed in the red tin. If 1/4 of all the cookies were placed in the blue tin, what fraction of the cookies that were placed in the other tins were placed in the green tin

A. 15/2 B. 9/4 C. 5/9 D. 7/5 E. 9/7

Not a clear question! How one can infer/imply "other tins" mean "green + red tins"? Is that the massage the question supplying? How "other tins" is not mean "blue + red tins"?

Just to get the idea about the question i..e. how precisely and correctly the quesion is designed? Is it a question unnecessarily designed to be a tough or is it really tough?

For me, its not a standard GMAT level question.
_________________

Not a clear question! How one can infer/imply "other tins" mean "green + red tins"? Is that the massage the question supplying? How "other tins" is not mean "blue + red tins"?

Just to get the idea about the question i..e. how precisely and correctly the quesion is designed? Is it a question unnecessarily designed to be a tough or is it really tough?

For me, its not a standard GMAT level question.

If 1/4 of all the cookies were placed in the blue tin, what fraction that were placed in the other tins were placed in the green tin?

I think that the question implies that other tins then blue, as previously the stem in the same sentence was describing the fraction in blue tin.

I don't know the source but for me this could be the GMAT question.
_________________

Not a clear question! How one can infer/imply "other tins" mean "green + red tins"? Is that the massage the question supplying? How "other tins" is not mean "blue + red tins"?

Just to get the idea about the question i..e. how precisely and correctly the quesion is designed? Is it a question unnecessarily designed to be a tough or is it really tough? For me, its not a standard GMAT level question.

Precisely! This question creates an ambiguity (other tins). I saw this today in the Kaplan 800 book. Its a fairly simple question otherwise. Just to make the question tough, Kaplan has created an ambiguity - which doesnt make any sense!

Bunuel, GMAT tiger, how would you rate the level of problems in the Kaplan 800 book (Quant/verbal)

Not a clear question! How one can infer/imply "other tins" mean "green + red tins"? Is that the massage the question supplying? How "other tins" is not mean "blue + red tins"?

Just to get the idea about the question i..e. how precisely and correctly the quesion is designed? Is it a question unnecessarily designed to be a tough or is it really tough? For me, its not a standard GMAT level question.

Precisely! This question creates an ambiguity (other tins). I saw this today in the Kaplan 800 book. Its a fairly simple question otherwise. Just to make the question tough, Kaplan has created an ambiguity - which doesnt make any sense!

Bunuel, GMAT tiger, how would you rate the level of problems in the Kaplan 800 book (Quant/verbal)

Honestly I do not use Kaplan or PTR materials because the feedback from many forum members is that they do not provide OG level questions. Many Kaplan and PTR questions are flawed and sub-standard. They claim to be leaders in GMAT Prep but they ended up being too far to reality.

For me, retired ETS-GMAT questions, LSAT RC/CR, 1000 questions, Manhattan Gmat books are best.

I guess you can find the feedback on major gmat materials on this forum as well - will post if I find the link.
_________________

I agree that Kaplan is not a good source of difficult questions. Even the title, Kaplan 800, was changed to Kaplan "Advanced" because they acknowledged the fact that their questions were no where near the difficulty level of 800.

Anywho... Here is how I solved the question.

I think it is easier to just assume that the total number of cookies is "1":

This will help reduce the number of variables you have to deal with:

G + B = 2/3 R = 1/3 B = 1/4

We can solve for G which is 5/12

What fraction (let it equal X) of the cookies that were placed in the other tins were placed in the green tin?

I think that there is some ambiguity to the question. Since there were 2/3 and 1/4 in the question, I assumed the total number of cookies to be 12 and worked from there. The answer came out to be 5/7. I am not sure about it coming to be 5/9.

Let Total no. of cookies = 12 (LCM(3,4)) Cookies in Blue +Green Tin = (2/3)*12 = 8 Cookies in Red Tin = 12-8 = 4 Cookies in Blue tin = (1/4)*12 = 3 Cookies in Green Tin = 8-3 = 5 Green/other(other than Blue) = 5/(4+5) = 5/9 (C)

A batch of cookies was divided amomg 3 tins: 2/3 of all the cookies were placed in either the blue or the green tin, and the rest were placed in the red tin. If 1/4 of all the cookies were placed in the blue tin, what fraction of the cookies that were placed in the other tins were placed in the green tin

A. 15/2 B. 9/4 C. 5/9 D. 7/5 E. 9/7

Ambigous question we will get G/B+R = 5/7 which is not even the answer choice.

Honestly I do not use Kaplan or PTR materials because the feedback from many forum members is that they do not provide OG level questions. Many Kaplan and PTR questions are flawed and sub-standard. They claim to be leaders in GMAT Prep but they ended up being too far to reality.

For me, retired ETS-GMAT questions, LSAT RC/CR, 1000 questions, Manhattan Gmat books are best.

I guess you can find the feedback on major gmat materials on this forum as well - will post if I find the link.

Hi GT.... which books do you reckon for Quant. Manhattan Books are good.. but practise questions are too less. I need to practise some good 700 level question to improve and hence I need a good book! I tried checking PR 1012 but the book too many misprints and hence I didnt enjoy it much! Kinda misleads u! Any suggestion you have?
_________________

Cheers! JT........... If u like my post..... payback in Kudos!!

|Do not post questions with OA|Please underline your SC questions while posting|Try posting the explanation along with your answer choice| |For CR refer Powerscore CR Bible|For SC refer Manhattan SC Guide|

A batch of cookies was divided among three tins: 2/3 of all the cookies were placed in either the blue tin or the green tin, and the rest were placed in the red tin. If 1/4 of all the cookies were placed in the blue tin, what fraction of the cookies that were placed in the other tins were placed in the green tin? A) 15/2 B) 9/4 C) 5/9 D) 7/5 E) 9/7

I was frustrated at this question by the way it worded. The OA is C, what the hell. I got D instead. Please explain. Thanks

A batch of cookies was divided among three tins: 2/3 of all the cookies were placed in either the blue tin or the green tin, and the rest were placed in the red tin. If 1/4 of all the cookies were placed in the blue tin, what fraction of the cookies that were placed in the other tins were placed in the green tin? A) 15/2 B) 9/4 C) 5/9 D) 7/5 E) 9/7

I was frustrated at this question by the way it worded. The OA is C, what the hell. I got D instead. Please explain. Thanks

B + G = 2/3 R = 1 - 2/3 = 1/3 B = 1/4 So G = 2/3 - 1/4 = 5/12 G/(G+R) = G/(1-B) = (5/12)/(3/4) = 5/9
_________________

A batch of cookies was divided among three tins: 2/3 of all the cookies were placed in either the blue tin or the green tin, and the rest were placed in the red tin. If 1/4 of all the cookies were placed in the blue tin, what fraction of the cookies that were placed in the other tins were placed in the green tin? A) 15/2 B) 9/4 C) 5/9 D) 7/5 E) 9/7

I was frustrated at this question by the way it worded. The OA is C, what the hell. I got D instead. Please explain. Thanks

B + G = 2/3 R = 1 - 2/3 = 1/3 B = 1/4 So G = 2/3 - 1/4 = 5/12 G/(G+R) = G/(1-B) = (5/12)/(3/4) = 5/9

How did u assumed that it has to be G/(G+R) instead of (B+R) ? Can you please explain ?
_________________

GGG (Gym / GMAT / Girl) -- Be Serious

Its your duty to post OA afterwards; some one must be waiting for that...

I think that there is some ambiguity to the question. Since there were 2/3 and 1/4 in the question, I assumed the total number of cookies to be 12 and worked from there. The answer came out to be 5/7. I am not sure about it coming to be 5/9.

You, like me, have computed G/B+R. It is a confusing question.

I have been using Kaplan 800. I cant say anything about the entire book yet as i have not completed it. I have completed Sentence Correction , DS and half way through PS.

I can say that the PS algebra and word problems are in the 700-800 range. They have helped me a lot so far. The geometry is below 700.

Sentence Correction is also good.

DS is probably in the low 700-800 range. But i found this book to be more challenging than any other material available so it does help you for that gotcha questions on the exam

Re: A batch of cookies was divided amomg 3 tins: 2/3 of all the [#permalink]

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19 Jan 2015, 07:35

Even I solved the fraction as G/(B+R)=5/7 , which does not match with any of the given choices. Lets re look at the question "If 1/4 of all the cookies were placed in the blue tin, what fraction of the cookies that were placed in the other tins were placed in the green tin?"

If B=1/4 then others will be = 1-(1/4)=3/4 Fraction G/Others= (5/12)/(3/4)= 5/9................................. Answer
_________________

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gmatclubot

Re: A batch of cookies was divided amomg 3 tins: 2/3 of all the
[#permalink]
19 Jan 2015, 07:35

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