SOLUTION: john is three times as old as sally. john is presently 12 years old. how old would john be when he is twice as old as sally?

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Question 842244: john is three times as old as sally. john is presently 12 years old. how old would john be when he is twice as old as sally?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

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 highlight%2816%29

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

   16 = 2•8

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