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Hi, Good set-up work..note using p for paul's age
George is twice as old as paul
Let p and 2p represent paul and george's ages respectively
Question states***Togather, george and Paul have lived 18 years
+ 2p = 18
3p = 18
p = 6, paul's age. George is 12 (2*6)
CHECKING our Answer***
6 + 12 = 18