How many circles with a radius of 2.5 decimeters can be cut from a rectangular iron plate with a length of 40 decimeters and a width of 15 decimeters?
从一张长40分米，宽15分米的长方形铁板上最多能剪出多少个半径2.5分米的圆．
<gadget id="calculator">2.5 * 2</gadget>
<output>5</output>

<gadget id="calculator">40 / 5</gadget>
<output>8</output>

<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<result>24</result>