Final answer:
The three sisters will meet together every 60 days.
Step-by-step explanation:
In order to find the number of days that all three sisters will meet together, we need to find the least common multiple (LCM) of the three intervals at which they come home. The intervals are 5 days, 4 days, and 3 days.
To find the LCM, we can list the multiples of each interval and find the lowest common multiple:
- Multiples of 5: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, ...
- Multiples of 4: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, ...
- Multiples of 3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ...
The lowest common multiple of 5, 4, and 3 is 60. So all three sisters will meet together every 60 days.