A piece of wood is 15 meters long, and it takes 16 minutes to divide it into 5 sections on average. If it is divided into 8 sections on average, how many minutes will it take in total?
一根木头15米，把它平均分成5段，共需16分钟，如果把它平均分成8段，共需多少分钟．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">4 * 7</gadget>
<output>28</output>

<result>28</result>