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# A jar contains g green marbles and r red marbles. If 2 green and 14 re

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Math Expert
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A jar contains g green marbles and r red marbles. If 2 green and 14 re  [#permalink]

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16 Feb 2017, 02:39
00:00

Difficulty:

5% (low)

Question Stats:

93% (00:55) correct 7% (00:43) wrong based on 94 sessions

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A jar contains g green marbles and r red marbles. If 2 green and 14 red marbles are added, which of the following expresses the probability of then selecting a green marble at random?

A. g/r
B. (g+2)/(r+14)
C. (g+2)/(r+16)
D. (g+2)/(r+g+14)
E. (g+2)/(r+g+16)

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Re: A jar contains g green marbles and r red marbles. If 2 green and 14 re  [#permalink]

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16 Feb 2017, 03:17
probability of choosing some green marble: Total number of ending green marbles / total number of murbles

so ending green marble = g+2

total number = g +2 +r +14

so probability = (g+2) / (g +r +16)

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Re: A jar contains g green marbles and r red marbles. If 2 green and 14 re  [#permalink]

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17 Feb 2017, 09:18

Total choices = g +2 + r + 14

Favourable choices = g+ 2

Probability = (g+2) / (g +r +16)
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Re: A jar contains g green marbles and r red marbles. If 2 green and 14 re  [#permalink]

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18 Feb 2017, 22:46
Number of possible outcome = g+2
Total number of outcome = g+r+14+2 = g+r+16
So, probability of getting green marble is g+2/g+r+16 ie E
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Re: A jar contains g green marbles and r red marbles. If 2 green and 14 re  [#permalink]

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21 Feb 2017, 09:28
1
Bunuel wrote:
A jar contains g green marbles and r red marbles. If 2 green and 14 red marbles are added, which of the following expresses the probability of then selecting a green marble at random?

A. g/r
B. (g+2)/(r+14)
C. (g+2)/(r+16)
D. (g+2)/(r+g+14)
E. (g+2)/(r+g+16)

Since the jar contains g green marbles and r red marbles, it contains a total of g + r marbles. Once 2 green and 14 red marbles are added, the jar then contains a total of g + r + 16 marbles, of which g + 2 are green marbles.

Thus, the probability of selecting a green marble is (g + 2)/(g + r + 16).

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A jar contains g green marbles and r red marbles. If 2 green and 14 re  [#permalink]

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21 Feb 2017, 22:03
Bunuel wrote:
A jar contains g green marbles and r red marbles. If 2 green and 14 red marbles are added, which of the following expresses the probability of then selecting a green marble at random?

A. g/r
B. (g+2)/(r+14)
C. (g+2)/(r+16)
D. (g+2)/(r+g+14)
E. (g+2)/(r+g+16)

Probability = Favourable Outcomes / Total Outcomes

Green Marbles = g
Red marbles = r
Total Marbles = g+r

New Number of Green Marbles = g+2
New Number of Red Marbles = r+14
New Number of Total Marbles = (g+2)+(r+14) = g+r+16

Probability of Selecting a Green Marble = Total Green Marble / Total Number of Marbles = (g+2)/(g+r+16)

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Re: A jar contains g green marbles and r red marbles. If 2 green and 14 re  [#permalink]

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10 Mar 2017, 00:45
g+2/g+r+16 , probability of selecting green marbles
Re: A jar contains g green marbles and r red marbles. If 2 green and 14 re &nbs [#permalink] 10 Mar 2017, 00:45
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