Question

two ships sail between New York and London. One makes the round trip in 12 days, the other in 16 days. They both leave London today. In how many days will both ships leave London together again?

Answer 1

THIS is where you use what you learned about the "Least Common Multiiple" of two numbers.

The ships will be "in sync" again after 48 days, and every 48 days after that.