You can
put this solution on YOUR website!well, 4 and 6 have the following common multiples:
12
24
36
48
60 etc
Add in 5 too and the first number in this sequence that 5 goes into is 60.
So, for 40 and 60:
120
240
360
480
600
And consider 50 too now, and we get 600.
Jon