How many round planks with a radius of 1 decimeter can be sawed from a board 10 decimeters long and 6 decimeters wide?
一块长10分米，宽6分米的木板，可以锯出多少个半径为1分米的圆木板．
<gadget id="calculator">1 * 2</gadget>
<output>2</output>

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

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

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

<result>15</result>