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Hi,
Let x represent John's age ⇒
is Sue's age
Question States*** Sue is 9 years older than twice John's age.
(48-x) = 2x + 9
39 = 3x
x = 13, John's age. Sue is 35 
CHECKING our answer*** Sue is 9 years older than twice John's age
35= 2•13 + 9 = 26 + 9 = 35
Wish You the Best in your Studies.