A ferry can hold 27 cars at a time. How many trips must it make to carry 164 cars across the river?

Answer 1

The ferry can hold 27 cars at a time, so it would take a total of 164 / 27 = 6.07 trips to carry 164 cars across the river.
Since the ferry cannot make a fraction of a trip, it would need to make a total of 7 trips to carry 164 cars across the river.