Take the amount of rows in the auditorium, 15, and multiply that by the number of new seats in each row, 3. You get 45. Now multiply the number of new seats, 45, by the cost of each seat, $74. You get $3,330.
The Greatest Common Factor of 16, 100 is 4.
4 pounds of books because 60 oz only equals 3.75 pounds.
