A piece of iron sheet with a length of 1.2 meters and a width of 0.9 meters is cut into discs with a radius of 15 cm. How many pieces can be cut at most?
一块长1.2米，宽0.9米的铁皮，剪成半径为15厘米的圆片，最多可以剪几块？
<gadget id="calculator">1.2 * 100</gadget>
<output>120</output>

<gadget id="calculator">120 / 30</gadget>
<output>4</output>

<gadget id="calculator">0.9 * 100</gadget>
<output>90</output>

<gadget id="calculator">90 / 30</gadget>
<output>3</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<result>12</result>