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11 Aug 2025, 23:58
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Difficulty:
5%
(low)
Question Stats:
92% (00:57) correct
8%
(01:13)
wrong
based on 84
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A jar is filled with 60 marbles. All the marbles in the jar are either red or green. What is the smallest number of marbles that must be drawn from the jar in order to be certain that a red marble is drawn?
(1) The ratio of red marbles to green marbles is 2 : 1.
(2) There are 20 green marbles in the jar.
Gentle note to all experts and tutors: Please refrain from replying to this question until the Official Answer (OA) is revealed. Let students attempt to solve it first. You are all welcome to contribute posts after the OA is posted. Thank you all for your cooperation!
(1) The ratio of red marbles to green marbles is 2 : 1.
(2) There are 20 green marbles in the jar.
Gentle note to all experts and tutors: Please refrain from replying to this question until the Official Answer (OA) is revealed. Let students attempt to solve it first. You are all welcome to contribute posts after the OA is posted. Thank you all for your cooperation!
12 Aug 2025, 02:32
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A jar is filled with 60 marbles. All the marbles in the jar are either red or green. What is the smallest number of marbles that must be drawn from the jar in order to be certain that a red marble is drawn?
If we understand the question here then we have got the answer.
In order to be certain that a red marble is drawn, all marbles have to be red or the probability of drawing a red marble is 1. So we simply need to draw all green marbles.
(1) The ratio of red marbles to green marbles is 2 : 1.
Sufficient
We can calculate red and green marbles.
(2) There are 20 green marbles in the jar.
Sufficient
We are directly given the number of green marbles.
(D) is the answer
If we understand the question here then we have got the answer.
In order to be certain that a red marble is drawn, all marbles have to be red or the probability of drawing a red marble is 1. So we simply need to draw all green marbles.
(1) The ratio of red marbles to green marbles is 2 : 1.
Sufficient
We can calculate red and green marbles.
(2) There are 20 green marbles in the jar.
Sufficient
We are directly given the number of green marbles.
(D) is the answer
12 Aug 2025, 10:14
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To determine we need to just know the share of the marbles in the jar.
Total marbles are 60.only red and green marbles are there .
Option1.
The ratio of red to green 2:1
Red marbles 40 green marbles 20.
Hence this option is sufficient
Option 2.
There are 20 green marbles. That means there are 40 red marbles.
This option is also sufficient to find out the answer
Hence it should be option D
Total marbles are 60.only red and green marbles are there .
Option1.
The ratio of red to green 2:1
Red marbles 40 green marbles 20.
Hence this option is sufficient
Option 2.
There are 20 green marbles. That means there are 40 red marbles.
This option is also sufficient to find out the answer
Hence it should be option D
Bunuel
