A piece of wood is 24 decimeters long, and it needs to be sawed into 4 decimeters long sticks, each sawing costs 3 cents, how many minutes will it take to saw all of them.
一根木头长24分米，要锯成4分米长的木棍，每锯一次要3分，全部锯完需要多少分．
<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

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

<result>15</result>