Question 978392: Question:
Albert is twice as old as Betty. Five years ago, Albert was twice as old as Betty. Find their present ages.
Answer by ikleyn(52879)   (Show Source):
You can put this solution on YOUR website!
Hello, it looks like your condition is wrong.
Indeed, let a be the Albert's age now, and let b be the Betti's age now.
Then you have an equation
a = 2b, (1)
according to the condition.
Five years ago Albert's age was (a-5) and Betti's age was (b-5).
So, you have the second equation
a - 5 = 2*(b-5), (2)
according to the condition.
Now, simplify the second equation:
a - 5 = 2b - 10,
a = 2b - 5.
It contradicts to the equation (1).
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