Question 179297
At work one day, Erica Franz received 7 packages. Speedy delivery delivered twice as many as Ralph's Express, while Ralph's Express delivered one more package than SendQuick package. How many packages did each service deliver to Erica. 
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Equations:
s + r + q = 7
s = 2r
r = q + 1
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Rearrange:
s  +  r  +  q  = 7
s  - 2r  +  0  = 0
0  +  r  -  q  = 1
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Use any method you know to get:
s = 4
r = 2
q = 1
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Cheers,
Stan H.