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14 Apr 2019, 23:02
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
82% (01:26) correct
18%
(02:48)
wrong
based on 68
sessions
History
Date
Time
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Not Attempted Yet
A bag consists of 56 marbles, each of which is either green, white, or red. If the probability of selecting a green marble is twice the probability of selecting a red marble, and the probability of selecting a white marble is twice the probability of selecting a green marble, how many red marbles are in the bag?
(A) 7
(B) 8
(C) 14
(D) 16
(E) 28
(A) 7
(B) 8
(C) 14
(D) 16
(E) 28
14 Apr 2019, 23:14
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Since there are 56 marbles
So, g + w + r = 56
according to question,
g = 2r
w = 2g
we can substitute each of the equations
and solve for g and find g= 16
Now solve for the number of red marbles:
16 = 2r
r =8
So, g + w + r = 56
according to question,
g = 2r
w = 2g
we can substitute each of the equations
and solve for g and find g= 16
Now solve for the number of red marbles:
16 = 2r
r =8
15 Apr 2019, 00:32
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Ratio of G:R is 2:1
Ratio of W:G is 4:1
the ratio of R:W:R:Total is 2:4:1:7
if total is 56, so R = 8, which is Answer B
Ratio of W:G is 4:1
the ratio of R:W:R:Total is 2:4:1:7
if total is 56, so R = 8, which is Answer B
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