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January 27, 2015

January 27, 2015

Posted by **Sarah** on Thursday, December 9, 2010 at 7:47pm.

- Math -
**Reiny**, Thursday, December 9, 2010 at 9:49pmlets 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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