A bag contains 9 blue marbles and 3 red marbles. two marbles are drawn at random and at the same time. what is the probability o
2 answers:
The total number of marbles in the bag are 12 (9 blue marbles and 3 red marbles).
Let "A" be the event that both the drawn marbles are blue.
Therefore, if two marbles are drawn at random and at the same time, then the probability of getting two blue marbles can be calculated as:
This can also be expressed in terms of percentage as:
%
Thus, the required probability is either: or 75%
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Explanation:
Remember: we have to isolate the variable x, so that means we have to get x by itself.
Step 1:
Let’s look at our equation:
Let’s subtract 2x from both sides of the equation, since our goal is to isolate the variable. You could also subtract 6x from both sides, but you would end up with a negative number, and I find it easier to deal with positive numbers.
Step 2:
Now, let’s subtract 57 from both sides of our equation.
Step 3:
Since we have to isolate x, let’s divide both sides of the equation by 4.
Our final answer: x = 64.5
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