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Ten colored marbles are placed in a bowl. Each of the marbles is one o

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Ten colored marbles are placed in a bowl. Each of the marbles is one o  [#permalink]

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New post 22 Jan 2016, 09:40
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A
B
C
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E

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  15% (low)

Question Stats:

85% (00:58) correct 15% (01:10) wrong based on 81 sessions

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Ten colored marbles are placed in a bowl. Each of the marbles is one of three colors—blue, red, or green. How many of the ten marbles are green?

(1) The probability of selecting a red marble from the bowl is 1 out of 5.
(2) The probability of selecting a blue marble is twice that of selecting a red marble.

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Re: Ten colored marbles are placed in a bowl. Each of the marbles is one o  [#permalink]

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New post 22 Jan 2016, 10:46
I think its a perfect C trap Question & hence I'll go with B
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Re: Ten colored marbles are placed in a bowl. Each of the marbles is one o  [#permalink]

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New post 22 Jan 2016, 20:03
(1) The probability of selecting a red marble from the bowl is 1 out of 5.
Total number of marbles = 10
Prob of selecting red marbles, P(Red) = 1/5
Therefore , number of red marbles = 2
We have no information of number of green marbles
Not sufficient
(2) The probability of selecting a blue marble is twice that of selecting a red marble.
P(Blue) = 2 * P(Red)
But since we have no information on actual number of either , we can't determine number of green marbles.
If number of blue =2 and red = 1 , green = 7
if number of blue =4 and red = 2 , green = 4
if number of blue =6 and red = 3 , green = 1
Not sufficient

Combining 1 and 2 , we get
Number (Red )=2
Number (Blue) = 4 and number (Green )= 4

Answer C
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Re: Ten colored marbles are placed in a bowl. Each of the marbles is one o  [#permalink]

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New post 22 Jan 2016, 20:08
paidlukkha wrote:
I think its a perfect C trap Question & hence I'll go with B


Hi,
Never answer a Q just by thinking it to be a kind of a trap...
You may do the guessing part if you do not find any way to move ahead..
This Q is easily do-able
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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


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Re: Ten colored marbles are placed in a bowl. Each of the marbles is one o  [#permalink]

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New post 22 Jan 2016, 23:14
chetan2u wrote:
paidlukkha wrote:
I think its a perfect C trap Question & hence I'll go with B


Hi,
Never answer a Q just by thinking it to be a kind of a trap...
You may do the guessing part if you do not find any way to move ahead..
This Q is easily do-able


Yes, I did try to solve S2 & thought it was suff
but Yes, not every Q is a C trap

Thanks :)
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Re: Ten colored marbles are placed in a bowl. Each of the marbles is one o &nbs [#permalink] 22 Jan 2016, 23:14
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