SOLUTION: Sarah is 3 times older than Joe. Their ages added together add up to 16. How old is Sarah?

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Question 348905: Sarah is 3 times older than Joe. Their ages added together add up to 16. How old is Sarah?
Found 2 solutions by Fombitz, Alan3354:
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let S be Sarah's age and J be Joe's age,
S=3%2AJ
S%2BJ=16
Substitute,
3J%2BJ=16
4J=16
highlight%28J=4%29 years old
Then
S=3%284%29
highlight%28S=12%29 years old

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Sarah is 3 times older than Joe. Their ages added together add up to 16. How old is Sarah?
-------------
3 times older = 4 times as old
S = 4J
S + J = 16
Sub for S
4J + J = 16
5J = 16
J = 3.2
S = 12.8