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A bowl contains 15 marbles, all of which are either red or blue. If th
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29 Sep 2021, 04:20
29 Sep 2021, 04:20
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A bowl contains 15 marbles, all of which are either red or blue. If the number of red marbles is one more than the number of blue marbles, what is the probability that a marble selected at random is blue?
A. 1/15
B. 2/15
C. 7/15
D. 1/2
E. 8/15
A. 1/15
B. 2/15
C. 7/15
D. 1/2
E. 8/15
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
Re: A bowl contains 15 marbles, all of which are either red or blue. If th
[#permalink]
29 Sep 2021, 05:16
29 Sep 2021, 05:16
1
Carcass wrote:
A bowl contains 15 marbles, all of which are either red or blue. If the number of red marbles is one more than the number of blue marbles, what is the probability that a marble selected at random is blue?
A. 1/15
B. 2/15
C. 7/15
D. 1/2
E. 8/15
A. 1/15
B. 2/15
C. 7/15
D. 1/2
E. 8/15
The number of red marbles is one more than the number of blue marbles. And there are 15 marbles in total
Let B = # of blue marbles
So, B + 1= # of red marbles
Since there are 15 marbles in total, we get: B + (B + 1) =15
Simplify: 2B + 1 = 15
So 2B = 14
B = 7
So, there are 7 blue marbles and 8 red marbles
What is the probability that a marble selected at random is blue?
P(blue) = 7/15
Answer: C
Re: A bowl contains 15 marbles, all of which are either red or blue. If th
[#permalink]
11 Jul 2024, 14:01
11 Jul 2024, 14:01
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Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
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