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"Amie is five years younger than his brother Benny. 
Amie is Benny's age minus 5.
Amie = (B-5)
In four years from now, Benny will be twice as old as Amie. 
Four years from now Benny will be B+4 and Amie will be (B-5)+4.
Then B+4 will equal 2[(B-5)+4]
     B+4 = 2[(B-5)+4]
Solve that for Benny's age now.
Then substitute what you get in
Amie = (B-5)
to find Amie's age now.
Edwin