A rectangle is 6 decimeters long and 4 decimeters wide, how many circles with a radius of 2 centimeters can be drawn at most.
一个长方形长是6分米，宽是4分米，最多画半径2厘米的圆多少个．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">10 / 4</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">6 * (5/2) * 4 * (5/2)</gadget>
<output>150</output>

<result>150</result>