Answer: least common multiple and they meet up on the 28th day.
Step-by-step explanation: Sally's family goes on their 7th trip on the 28th day since 7*4 =28. Mary's family goes on their 2nd trip also on the 28th day since 14 * 2 = 28. 28 is the LCM.
Answer:
They would meet on the 28th day; Least common multiple.
Step-by-step explanation: