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September 18, 2014

September 18, 2014

Posted by **TIM** on Wednesday, February 20, 2008 at 5:57pm.

- Math -
**Damon**, Wednesday, February 20, 2008 at 7:01pmP + R = 89

R + S = 80

P + S = 85

combine the first two equations by subtraction

P - S = 9

add that to the third

2 P = 94

P = 47

S = P-9 = 38

R = 80 - S = 42

check that

P+R = 47+42 = 89 yes

R+s = 42+38 = 80 yes

P+S = 47+38 = 85 yes

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