There are 4 classrooms on each floor, and 5 potted flowers are placed in each classroom. How many potted flowers are placed on the three floors? (Solved in two ways)
每层有4个教室，每个教室放5盆花，三层一共放多少盆花？(用两种方法解决)
<gadget id="calculator">4 * 3 * 5</gadget>
<output>60</output>

<result>60</result>