How many tiles are needed to pave a floor with a length of 30 meters and a width of 12 meters with 20 decimeters and a width of 10 decimeters?
用20分米宽10分米的地砖去铺长30米，宽12米的地面，共需多少块？
<gadget id="calculator">30 * 12</gadget>
<output>360</output>

<gadget id="calculator">20 / 10</gadget>
<output>2</output>

<gadget id="calculator">10 / 10</gadget>
<output>1</output>

<gadget id="calculator">2 * 1</gadget>
<output>2</output>

<gadget id="calculator">360 / 2</gadget>
<output>180</output>

<result>180</result>