Four bells first begin to toll together and then at intervals of 6, 7, 8 and 9 seconds respecively. After how many seconds all the bells will ring together?

Question

perl · Answer

bell 1 :  6, 12, 18, 24, 30 , 36, 
bell 2 :  7, 14, 21, 28, 35 , 42, 
bell 3 :  8, 16, 24, 32, 40 , 48, 
bell 4 :  9, 18, 27, 36, 45, 54,

perl · Answer

I started it, see if you can

perl · Answer

see if you understand the question, what its asking
those are the times when the bells ring, your job is to find the first time when they ring together

perl · Answer

now writing the multiplies is kind of tedious, is there a faster way to do it?

perl · Answer

here is a hint
use 
LCM ( 6, 7, 8, 9)

LCM = lowest common multiple

anonymous · Answer

yeah.. got it :D