perplexus.info :: Just Math : Fill in

Fill in (Posted on 2004-07-20)

8448 is a multiple of 44. Change the two 4s for different odd numbers X and Y, so 8XY8 can be divided by XY. No computers allowed!

Submitted by Federico Kereki

Rating: 2.7143 (7 votes)

Solution: (Hide)

In order for 8XY8 to be a multiple of XY, 8008 must also be a multiple of XY. Since 8008=7*8*11*13, if X and Y are odd and different, XY can only be 13 or 91.

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
Puzzle Solution	K Sengupta	2008-03-13 15:12:57
answer	K Sengupta	2007-07-31 15:51:00
More to the solution	Dej Mar	2006-05-08 02:26:48
it's really hard.	christine	2005-06-16 12:59:03
Full Solution	DJ	2004-07-20 13:42:15
re: Solution	ThoughtProvoker	2004-07-20 13:02:24
Solution	Gamer	2004-07-20 12:59:37
Solution	Eric	2004-07-20 12:56:49

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