Hi,

john is three times as old as sally. john is presently 12 years old. 

John is now 12 and sally is now 4

how old would john be when he is twice as old as sally?

Let x represent the time before john is twice as old as sally

  12 + x = 2(4 + x)

  12 + x = 8 + 2x

     4 = x  (In four years when John is 

CHECKING our answer***In four years...

   16 = 2•8

Wish You the Best in your Studies.

 

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