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                    Ryan         Audrey

Before            2u              7u

 +/-               +20              -80

After                p                 3p

p = 2u+20

3p=7u-80

3(2u+20) = 7u-80

6u+60 = 7u-80

u = 140

Hence Audrey has 7×140 = 980 marbles at first.

 

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