The number of school choirs is between 20 and 30, which can be arranged in square teams of 4 or 6 rows (the number of people in each row is the same). How many people are there in the school chorus?
学校合唱队的人数在20和30之间，可排成4行或6行的方队(每行人数同样多)．学校合唱队有多少人？
<gadget id="calculator">2 * 2 * 3</gadget>
<output>12</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<result>24</result>