Hi

Let x represent tom's age and y Tim's age    

x + y = 21  0r  y = 

In 3 years...

x + 3 = 2[(21-x)+3]

x + 3 = 2[24-x]

x + 3 = 48 - 2x

  3x = 45

   x = 15, Tom's age.  Tim is 6  

CHECKING our answer***In 3 years

  18 = 2•9

Wish You the Best in your Studies.

 

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