Least Common Multiple (LCM) for 50 120 is 600.
10x5
You do 20x6
50
50
50
50
117
10x5
5! = 5 factorial = 5x4x3x2x1 = 20x6 = 120
20x6 is 120 so 19x6 is 120-6 which is 114
120 (12x10, 20x6, and 40x3)
Lowest common multiple would be 120. 20x6=120, 24x5=120. The number would have to end in a 0, because of the 20. The lowest would be 120. 60 wouldn't work because 24 can't divide into it. Hope this helps :D