1. If we start with [math] students and subtract 60 students, how many students remain? [math] students.
  2. If we start with [math] students and subtract [math] students three consecutive times, how many students remain?
    [math] [math] [math]
    [math]
    [math]
  3. Is one decrease of [math] students the same as three decreases of [math] students?