Total no of marbles
Number of Marbles removed
Marbles in the box
Probability of drawing one green marble is
Among the remaining 6 marbles, x number of marbles are green.
Then Probability of drawing one green marble is = number of green marbles / Total Number of marbles.
After 5 marbles are removed from the box, the number of green marbles remaining is 3.
It means out of 4 green marbles, one green marble has been removed.
Out of 5 marbles one marble is green. Then the other four must be red.
Then number of red marbles removed were .