When trying to find the probability of drawing a violet marble from a jar containing 9 red, 4 brown, 10 yellow, and 8 violet marbles

Answer 1

Number of marbles = 9 + 4 + 10 + 8 = sum

Number of violet marbles = 8

If you just pull one marble out at random then the probability that it is violet is

8 / sum

Answer 2

There are 13 blue marbles. The blue marbles are three more than twice the number of red marbles. How many red marbles are there? What are the correct answer

Answer 3

31

Answer 4

Let's use "r" to represent the number of red marbles.

We are given that there are 13 blue marbles.

We are also told that the number of blue marbles is three more than twice the number of red marbles:

Number of blue marbles = 3 + 2r

We can set up an equation to represent the total number of marbles:

Total number of marbles = number of red marbles + number of blue marbles

Total number of marbles = r + (3 + 2r)

Simplifying:

Total number of marbles = 3r + 3

We know that the total number of marbles is 13 + the number of red marbles:

Total number of marbles = 13 + r

So we can set these two equations equal to each other:

3r + 3 = 13 + r

Simplifying:

2r = 10

r = 5

Therefore, there are 5 red marbles.