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September 23, 2014

September 23, 2014

Posted by **peter** on Saturday, December 18, 2010 at 11:26pm.

- Math -
**drwls**, Sunday, December 19, 2010 at 2:36amR1/W1 = 7

R2/W2 = 9

W1 + W2 = 90

R1 + W1 = R2 + W2

Four equations in four unknowns.

Change the last equation by substitution to get rid of R1 and R2.

7W1 + W1= 9W2 + W2

8W1 - 10 W2 = 0

10W1 + 10W2 = 900

18 W1 = 900

W1 = 50

R1 = 350

W2 = 40

R2 = 360

There are 360 red marbles in jar 2

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