Posted by Sarah on Thursday, December 9, 2010 at 7:47pm.
lets add x yellow marbles
so (x+8)/(x+13) = 2/3
3x + 24 = 2x + 26
x = 2
must add 2 yellows
or
lets add y orange marbles
8/(y+13) = 2/3
2y + 26 = 24
2y = -2
y = -1
or we could take out 1 orange marble
Proof:
yellow = 8
orange = 4
total = 12
prob of yellow = 8/12 = 2/3
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