A carpenter saws a piece of wood with a length of 15 meters, and every 3 meters long, it takes 5 minutes to cut it and rests for 2 minutes. How many minutes does it take to finish sawing this piece of wood?
一个木工锯一根长15米的木料，每3米长锯一段，锯断一次要5分钟，休息2分钟，锯完这根木料一共用了多少分钟？
<gadget id="calculator">15 / 3</gadget>
<output>5</output>

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

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

<gadget id="calculator">5 - 1 - 1</gadget>
<output>3</output>

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

<gadget id="calculator">20 + 6</gadget>
<output>26</output>

<result>26</result>