SOLUTION: Amy is twice as old as Jenny. Five years ago, Amy was three times as old as Jenny. Find Jenny's age.

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Question 290790: Amy is twice as old as Jenny. Five years ago, Amy was three times as old as Jenny. Find Jenny's age.
Answer by Deina(147) About Me  (Show Source):
You can put this solution on YOUR website!
Amy = A
Jenny = J

+A+=+2J+ so +A+-+2J+=+0+

+A-5+=+3%28J-5%29+

+A-5+=+3J+-+15+%2B+5+

+A-3J+=+-10+



Since:
+A+-+2J+=+0+

+A-3J+=+-10+

So -J = -10 therefore J = 10

Now we've found that Jenny is ten, and since Amy is twice as old:
Jenny = 10, Amy = 20
and bob's your uncle!