Take a 2-meter-long piece of wood and saw it into 4 pieces of the same length, how many decimeters each piece is.
用一根2米长的木料，锯成同样长的4根，每根长多少分米．
<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<result>5</result>