A rectangular cardboard with a length of 12 decimeters and a width of 8 decimeters, how many circles with a diameter of 4 decimeters can be cut from this rectangle at most.
长12分米，宽8分米的长方形纸板，在这个长方形中最多可以裁剪直径是4分米的圆形多少个．
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>