Question

At a local restaurant, the health inspector visits every 7 days, and the fire inspector visits every 12 days.

Answer 1

Next 4 visits :
health inspector : 7,14,21,28
fire inspector : 12,24,36,48

visit the same day :
7,14,21,28,35,42,49,56,63,70,77,84
12,24,36,48,60,72,84
Both inspectors will be there on the 84th day