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. 

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