Answer:
The answer to your question is: Every 24 days they both be on the menu
Step-by-step explanation:
Data
tacos every 6 days
cheeseburgers every 8 days
Process
Get the minimum common multiple
6 8 2
3 4 2
3 2 2
3 1 3
1
Get the m.c.m. = 2 x 2 x 2 x 3 = 24