Posted by **Meg** on Monday, April 30, 2012 at 5:25pm.

a bag contains 9 red marbles and 4 blue marbles. how many clear marbles should be added to the bag so the probibility of drawing a red marble is 3/5?????

- Probability -
**Reiny**, Monday, April 30, 2012 at 5:45pm
let the number of clear marbles added be x

so prob of drawing a red

= 9/(13+x)

9/(13+x) = 3/5

39 + 3x =45

3x= 6

x = 2

2 clears should be added

check:

now the number of marbles would be 15

(9 red, 4 blue, 2 clear)

prob of a red = 9/15 = 3/5

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