SOLUTION: A is twice as old as B,three years ago,A was three times as old as B,how old is A now?

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Question 245764: A is twice as old as B,three years ago,A was three times as old as B,how old is A now?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
a=2b
a-3=3(b-3)
substitute
2b-3=3(b-3)
2b-3=3b-9
subtract 2b from both sides
-3=b-9
add nine to both sides
6=b
a=2b=12
check
a-3=(3(b-3)
12-3=3(3)
9=9
ok