A dance room is 20m long and 15m wide. How many square meters of wood should be used to lay a 3cm thick wooden floor?
一个舞蹈室长20m，宽15m，要铺设3cm厚的木质地板，至少要用多少方的木材？
<gadget id="calculator">3 / 100</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">20 * 15 * (3/100)</gadget>
<output>9</output>

<result>9</result>