A piece of wood with uniform thickness is 2 meters long, and it needs to be sawed into sticks of 4 decimeters each. It takes 3 minutes to saw each time and rest for 2 minutes after each sawing. How many minutes will it take to saw all the pieces?
一根粗细均匀的木头长2米，要锯成每段长4分米的木棍，每锯一次要3分钟，锯完一次休息2分钟，全部锯完要用多少分钟．
<gadget id="calculator">10 / 4</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">2 * (5/2)</gadget>
<output>5</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

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

<gadget id="calculator">12 + 6</gadget>
<output>18</output>

<result>18</result>