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by beater » Sun Oct 19, 2008 4:39 pm
Bag A contains red, white and blue marbles such that the red to white marble ratio is 1:3 and the white to blue marble ratio is 2:3. Bag B contains red and white marbles in the ratio of 1:4. Together, the two bags contain 30 white marbles. How many red marbles could be in bag A?

A. 1
B. 3

C. 4

D. 6

E. 8
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by amitabhprasad » Sun Oct 19, 2008 5:51 pm
Is OA - D ?
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by raunekk » Sun Oct 19, 2008 10:09 pm
A)
r:w:b= 2x:6x:9x

B)
r:w=1x:4x

total W marbles = 6x+4x=10x=30

x=3

from A,
r = 2x = 6

hence D
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by vittalgmat » Sun Oct 19, 2008 11:56 pm
raunekk wrote:A)
r:w:b= 2x:6x:9x

B)
r:w=1x:4x

total W marbles = 6x+4x=10x=30

x=3

from A,
r = 2x = 6

hence D
I am not sure if this is the right answer. Here u assumed both bags A and B have same amount of marbles (ie. x) which may not be the case.

Thanks
-V
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by vishubn » Mon Oct 20, 2008 12:51 am
No I dont think anything is assumed :)

Pretty straight forward and I get the same solution

Vishu
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by stop@800 » Mon Oct 20, 2008 3:41 am
vittalgmat wrote:
raunekk wrote:A)
r:w:b= 2x:6x:9x

B)
r:w=1x:4x

total W marbles = 6x+4x=10x=30

x=3

from A,
r = 2x = 6

hence D
I am not sure if this is the right answer. Here u assumed both bags A and B have same amount of marbles (ie. x) which may not be the case.
I accept you point.
but i think there is no other information to solve completely
and also
there is no choice such as "insufficient info"

so 6 sounds logical
Thanks
-V
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by vittalgmat » Mon Oct 20, 2008 5:17 am
stop@800 wrote:
vittalgmat wrote:
raunekk wrote:A)
r:w:b= 2x:6x:9x

B)
r:w=1x:4x

total W marbles = 6x+4x=10x=30

x=3

from A,
r = 2x = 6

hence D
I am not sure if this is the right answer. Here u assumed both bags A and B have same amount of marbles (ie. x) which may not be the case.
I accept you point.
but i think there is no other information to solve completely
and also
there is no choice such as "insufficient info"

so 6 sounds logical
Thanks
-V
My mistake. Dint read the Q properly..
This is one of the possible solutions. The Q stem says "could be". So I guess we can safely assume that both bags contain same #.
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Re: Ratios

by vittalgmat » Mon Oct 20, 2008 5:21 am
beater wrote:Bag A contains red, white and blue marbles such that the red to white marble ratio is 1:3 and the white to blue marble ratio is 2:3. Bag B contains red and white marbles in the ratio of 1:4. Together, the two bags contain 30 white marbles. How many red marbles could be in bag A?

A. 1
B. 3

C. 4

D. 6

E. 8
OA please??
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by beater » Mon Oct 20, 2008 5:27 am
OA - D.

Thanks!
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