A piece of wood is 20 meters long. It is sawed 4 times and cut into equal pieces. What is the length of each piece?
一段木头长20米，锯了4次锯成相等的小段，每段长多少米．
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

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

<result>4</result>