All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Just Math
Too Old For Young (Posted on 2003-05-24) Difficulty: 3 of 5
The ages of Old and Young total 48. Old is twice as old as Young was when Old was half as old as Young will be when Young is three times as old as Old was when Old was three times as old as Young.

How old is Old ?

See The Solution Submitted by Ravi Raja    
Rating: 4.0000 (5 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re: Solutions | Comment 5 of 11 |
(In reply to Solutions by DJ)

In
"When Old is three times as old as Young (call this time x):
Ax=3Bx=3(Ax-d)
Ax=3Ax-3d
Ax=(3/2)d "
what is the purpose of multiplying by x? (in fact, what is x to represent? ... years past the present?, years past one of their births?, etc.)

But in any case, the claim that Ax = 3Bx is really a claim that A=3B as the x's cancel. But that's claiming that Old is today three times as old as B. If x represents time past the present, it should be (A+x) = 3(B+x) = 3(A-d+x). And by the wording of the problem, I'm sure x would come out negative eventually to fit the tense.

  Posted by Charlie on 2003-05-25 05:37:39

Please log in:
Login:
Password:
Remember me:
Sign up! | Forgot password


Search:
Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (8)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2017 by Animus Pactum Consulting. All rights reserved. Privacy Information