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fractions!!

by neel_mutum » Fri Oct 22, 2010 4:57 am
A batch of cookies was divided among 3 tins, 2/3 of all the cookies were placed in either blue or the green tin, the rest were placed in red tin. If 1/4 of all the cookies were placed in the blue tin, what fraction of the 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
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by neel_mutum » Fri Oct 22, 2010 5:13 am
A batch of cookies was divided among 3 tins, 2/3 of all the cookies were placed in either blue or the green tin, the rest were placed in 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
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by kmittal82 » Fri Oct 22, 2010 5:40 am
neel_mutum wrote:A batch of cookies was divided among 3 tins, 2/3 of all the cookies were placed in either blue or the green tin, the rest were placed in 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 didn't get the answer, my here's my stab at it:

Lets chose a nice number which we can use... 12 looks nice, since its the LCM of 3 and 4. So, let there be 12 cookies

> 2/3 of all the cookies were placed in either blue or the green tin
8 cookies went in either blue or green

> the rest were placed in red tin
4 cookies went in the red tin

> 1/4 of all the cookies were placed in the blue tin
3 cookies went in blue
4 cookies went in red
5 cookies thus went in green

> what fraction of the cookies* that were placed in the other tins were placed in the green tin?
Total cookies in other tins = 7
Total cookies in green tin = 5

But... this should give an answer of 5/7, which I don't see... help! :(
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by neel_mutum » Fri Oct 22, 2010 6:10 am
Even i got the same answer.
but it says 5/9.. its from Kaplan800 maths page number:53
the answer =(number of cookies in Green/no. in green + no. in Red) why isnt blue included !!!
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by kmittal82 » Fri Oct 22, 2010 6:22 am
neel_mutum wrote:Even i got the same answer.
but it says 5/9.. its from Kaplan800 maths page number:53
the answer =(number of cookies in Green/no. in green + no. in Red) why isnt blue included !!!
Why is green included at all in the denominator is what I'm curious to know :)

> what fraction of the cookies* that were placed in the other tins were placed in the green tin?

Surely this means green/(red + blue), red and blue being the "other" tins compared to green.

Maybe this question should be in the verbal section instead :)
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by shovan85 » Fri Oct 22, 2010 7:35 am
neel_mutum wrote:Even i got the same answer.
but it says 5/9.. its from Kaplan800 maths page number:53
the answer =(number of cookies in Green/no. in green + no. in Red) why isnt blue included !!!
Because of the wordings in the question see the bold part:

A batch of cookies was divided among 3 tins, 2/3 of all the cookies were placed in either blue or the green tin, the rest were placed in 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?

Total Blue, Red and Green.

1/4 to the Blue, Other Red and Green. So, find the fraction Green to Other (Red + Green)

Thank god 5/7 is not there in the option ;)
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by diebeatsthegmat » Fri Oct 22, 2010 10:28 am
neel_mutum wrote:A batch of cookies was divided among 3 tins, 2/3 of all the cookies were placed in either blue or the green tin, the rest were placed in red tin. If 1/4 of all the cookies were placed in the blue tin, what fraction of the 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 did the same as you guys all did, and i got 5 for green tin, and guess its 5/7 then didnt see 5/7 in the answer choice thus guessed 5/9 and got the correct answer, however also found the other explaination from other forum
here is a good explaination, take a look at it
https://gmatclub.com/forum/a-batch-of-cookies-86680.html
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by diebeatsthegmat » Fri Oct 22, 2010 10:29 am
neel_mutum wrote:A batch of cookies was divided among 3 tins, 2/3 of all the cookies were placed in either blue or the green tin, the rest were placed in red tin. If 1/4 of all the cookies were placed in the blue tin, what fraction of the 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
https://www.beatthegmat.com/a-batch-of-c ... t=New-York
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