Saturday, May 12, 2007

An old one but a good one.

Bob is 104. He is twice as old as Alice was when Bob was as old as Alice is now. How old is Alice?

3 Comments:

Blogger Vineet said...

Let X be the Alice’s age
Let Y be the age gap between Alice and Bob.
So, as Bob is 104, Alice was 52 when Bob was 52 + Y.
But 52 + Y = X and X + Y = 104
X + Y = 104
X – Y = 52
2X = 156
X = 78!
So, Alice is 78!

May 14, 2007 at 7:05 AM  
Blogger steven said...

Correct!

May 19, 2007 at 10:02 PM  
Blogger steven said...

Correct!

May 19, 2007 at 10:02 PM  

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