Mr. Nguyen placed a cup containing 45 erasers on his desk in his classroom on Monday. Each day for 3 days, his students removed the same number of erasers from the cup. At the end of the third day, there were 18 erasers left in the cup. Which equation can be used to find the number of erasers the students removed from the cup each day?
O 45 – 3n = 18
45-18n - 3
O 45 x 3 - 18 =
45 x 3-1-18