A piece of land is just covered with 60 floor tiles with a side length of 3 decimeters. If it is covered with floor tiles with a side length of 2 decimeters, how many pieces should be needed?
一块地用边长3分米的地板砖60块恰好铺满，如果改用边长为2分米的地板砖铺满，应需要多少块？
<gadget id="calculator">3 * 3 * 60</gadget>
<output>540</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">540 / 4</gadget>
<output>135</output>

<result>135</result>