When training group gymnastics, the teams are required to be arranged in 6 rows, 9 rows, and 10 rows in a rectangle. How many people should participate in the rehearsal at least?
在训练团体操时，要求队伍分别排成6列，9列，10列时都是一个矩形，至少要多少人参加排练？
<gadget id="calculator">2 * 3 * 3 * 5</gadget>
<output>90</output>

<result>90</result>