Let amount Penny has, be P

Then amount Gregory has is: P + 6

Amount Phillip has is: P + 6 - 13, or P - 7

We then get: P + P + 6 + P - 7 = 29

3P - 1 = 29

3P = 30

P, or amount Penny has = , or 

Amount Gregory has: 10 + 6, or 

Amount Phillip has: 10 - 7, or  

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