The number of students in Class 1, Grade 5, Yuhong Primary School is between 45 and 60. When participating in tree planting activities, if every group of 6 or 9 people is just finished and there is no remaining. How many people are there in this class?
育红小学五年级1班学生人数在45～60之间．参加植树活动时，如果每6人一组或9人一组都刚好分完而无剩余．这个班有多少人．
<gadget id="calculator">2 * 3 * 3</gadget>
<output>18</output>

<gadget id="calculator">18 * 3</gadget>
<output>54</output>

<result>54</result>