SOLUTION: In a plastic jar there are 5 red marbles, 7 blue marbles, and 3 green marbles. How many green marbles need to be added to the jar in order to double the probability of selectin

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Question 639742: In a plastic jar there are 5 red marbles,
7 blue marbles, and 3 green marbles. How
many green marbles need to be added to
the jar in order to double the probability of
selecting a green marble?
a.2
b.3
c.5
d.6
e.7

Answer by reviewermath(1029) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = number of green marbles
probability of selecting green marble = %283+%2B+x%29%2F%2815+%2B+x%29+=+2%2F5
15+%2B+5x+=+30+%2B+2x
3x+=+15
x+=+5
Answer: highlight%285%29