SOLUTION: Joe is 15 years older than Sally. in 15 years Joe will be 3 times as old as sally is now. How old is Sally?

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Question 150895: Joe is 15 years older than Sally. in 15 years Joe will be 3 times as old as sally is now. How old is Sally?
Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
Let j be joe's age and s be sally's age.
Given j+=+s+%2B+15
j+-+15+=+s
Also given
j%2B15+=+3s
Substituting from above yields
j+%2B+15+=+3%28j+-15%29
j+%2B+15+=+3j+-+45
60+=+2j
30+=+j
Joe is 30
sally is 30-15 = 15