Which statement is modeled by the expression? 150k

The Henderson family drove 150 miles each day of their vacation. If their vacation lasted for k days, then 150k is the total number of miles they traveled on their vacation.

The cafeteria has a capacity of 150 seats. If k is the number of people in the cafeteria at lunch time, then 150k is number of seats that were not used at lunch time.

A librarian had 150 books to be placed on shelves with an equal number of books on each shelf. If k is the number of shelves to be used, then 150k is the number of books on each shelf.

Cory had 150 dollars in his savings account. He withdrew k dollars to buy a catcher's mitt. He then had 150k dollars left in his savings account.