SOLUTION: John is 8 years older than his sister. In 3 years he will be twice as old as she is. How old are they now? Let x represent the age of John's sister now

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 Question 543793: John is 8 years older than his sister. In 3 years he will be twice as old as she is. How old are they now? Let x represent the age of John's sister nowAnswer by stanbon(57219)   (Show Source): You can put this solution on YOUR website!John is 8 years older than his sister. In 3 years he will be twice as old as she is. How old are they now? Let s represent the age of John's sister now ---- Equations: j = s + 8 j+3 = 2(s+8) ---- Substitute for "j" and solve for "s": s+8+3 = 2s+16 s+11 = 2s+16 s = -5 (Sis's age now) Comment: That's the answer but that doesn't make any sense. -- Cheers, Stan H.