Hello, chadlyter

This is not a Permutations problem . . .

Presently, the ratio of red to green is: .The ratio of red marbles to green marbles in a container is 3 to 5.

How many red marbles should you add to the container withngreen marbles

so that the probability of getting a red marble is 7/8?

Give your answer in terms ofn.

If there are green marbles, the ratio is: .

. . and there are: . marbles in the container.

We will add red marbles.

Then there are: . red marbles

. . and: . marbles in the container.

Then we have: .

. .

. .