Bells

[mathxyz]

A bell rings every 2 hours, a second bell rings every 3 hours, and a third bell rings every 4 hours. If all 3 bells ring at 9:00 AM., at what time will all 3 bells next ring?

 

[pka]

Come on mathxyz.
Do some work for yourself.
Make a table: one column for bell 1, one for bell 2, and one for 3.
Start with
.9.....9....9
11...12....1
See what hour the three columns have in common.

 

[tkhunny]

Spreadsheets are particularly designed for making such lists. Do you have a spreadsheet program you can access?

 

[mathxyz]

ok

Thank you guys for your tips.

 

[Gene]

Or
The LCM is 12.
----------------
Gene

 

[mathxyz]

Gene

Thanks Gene.