SOLUTION: John is twice as old as Sarah. Three years from today, the sum of their ages will be 42. How old is John today?
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Question 387120: John is twice as old as Sarah. Three years from today, the sum of their ages will be 42. How old is John today?
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
j = 2s,
j+3 + s+3 = 42, or j + s = 36. Substituting the 1st equation into the last equation, we get 2s + s = 36, or 3s = 36, or s = 12, the age of Sarah now, and j = 2s = 24, the age of John.
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