SOLUTION: John is now 3 times as old as his brother Sam. In 5 years, John will be twice as old as Sam will be then. What are their present ages?

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Question 364810: John is now 3 times as old as his brother Sam. In 5 years, John will be twice as old as Sam will be then. What are their present ages?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
j = 3s,
j+5 = 2(s+5). By direct substitution,
3s+5 = 2s+10,
3s-2s = 10-5,
s = 5, the age of sam, while,
j = 3*5 = 15, the age of john.