SOLUTION: A is twice as old as B; ten years ago he was four times as old.what are their present ages?

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Question 452499: A is twice as old as B; ten years ago he was four times as old.what are their present ages?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
a-10=4*(b-10)
a=2b
2b-10=4b-40
30=2b
15=b
a=30
check
20=4*5
ok