2006
Mathematics
67ca00ce0c643c71d77dee1f
A bag contains 5 black, 4 white and x red marbles. If the probability of picking a red marble is 2/3, find the value of x
A.
8
B.
10
C.
4
D.
6
Correct Answer: 6
Explanation
Black = 5 White = 4 Red = x Total = 9+x P(red) = 2/3 x / (9+x) = 2/5 5x = 2(9+x) 5x = 18+2x 5x-2 = 18 3x = 18 x = 6
Black = 5 White = 4 Red = x Total = 9+x P(red) = 2/3 x / (9+x) = 2/5 5x = 2(9+x) 5x = 18+2x 5x-2 = 18 3x = 18 x = 6THIS WEEK's
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