SOLUTION: a bag contains 12 red marbles, 5 yellow marbles, and 15 green marbles. how many additional red marbles must be added to the 32 marbles already in the bag so that the probability ra
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Question 368015: a bag contains 12 red marbles, 5 yellow marbles, and 15 green marbles. how many additional red marbles must be added to the 32 marbles already in the bag so that the probability randomly drawing a red is 3/5
A: 13
B: 18
C: 28
D: 32
E: 40
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
Let x=how many additional red marbles must be added
(x+12)/(x+32)=3/5
5(x+12)=3(x+32)
5x+60+3x+96
2x=36
x=18
.
Ed
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