rectangular iron sheet with a length of 1.5 meters and a width of 0.9 meters is cut into discs with a diameter of 30 centimeters, and you can cut a few at most.
一块长1.5米，宽0.9米的长方形铁皮，剪成直径为30厘米的圆片，最多可以剪几个．
<gadget id="calculator">30 / 10</gadget>
<output>3</output>

<gadget id="calculator">10 / 3</gadget>
<output>10/3 = around 3.333333</output>

<gadget id="calculator">1.5 * (10/3) * 0.9 * (10/3)</gadget>
<output>15</output>

<result>15</result>