SOLUTION: Having some trouble trying to figure out this problem. Tom is 8 years older than his sister. In 4 years he will be twice his sister's age. How old is tom?

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Question 936474: Having some trouble trying to figure out this problem. Tom is 8 years older than his sister. In 4 years he will be twice his sister's age. How old is tom?
Found 2 solutions by stanbon, Alan3354:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Tom is 8 years older than his sister. In 4 years he will be twice his sister's age. How old is tom?
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Equations:
t = s + 8
t+4 = 2(s+4)
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Substitute for "t" and solve for "s":
s+8+4 = 2s+8
s = 4 (Sister's age now)
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Ans: t = s+8 = 12 (Tom's age now)
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Cheers,
Stan H.
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Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Having some trouble trying to figure out this problem. Tom is 8 years older than his sister. In 4 years he will be twice his sister's age. How old is tom?
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The difference in age is constant = 8 yrs.
--> 8 & 16 in 4 yrs.
--> 4 & 12 now