SOLUTION: jacob is three times as old as his brother.if jacob's age is 12,how old will jacob be when he is twice as old as his brother?

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Question 778957: jacob is three times as old as his brother.if jacob's age is 12,how old will jacob be when he is twice as old as his brother?
Answer by Edwin McCravy(20055) About Me  (Show Source):
You can put this solution on YOUR website!
jacob is three times as old as his brother.
J = 3B

if jacob's age is 12,
12 = 3B
 4 = B,  so the brother is 4

how old will jacob be when he is twice as old as his brother?
Let that be x years from now.  So in x years from now,

Jacob will be 12+x and his brother will be 4+x

12+x = 2(4+x)

12+x = 8+2x

   4 = x

So that will be 4 years from now

So Jacob will be 12+4 or 16 and his brother will be 4+4 or 8.

Answer:  Jacob will be 16.

Edwin