It takes 35 minutes to saw a piece of wood 4 meters long into 0.5 meters long. According to this calculation, how many minutes will it take to saw it into 0.4 meters in length?
把4米长的一根木料，锯成每段长0.5米，需要35分钟．照这样计算，如果把它锯成每段长0.4米，需要多少分钟？
<gadget id="calculator">4 / 0.5</gadget>
<output>8</output>

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

<gadget id="calculator">35 / 7</gadget>
<output>5</output>

<gadget id="calculator">4 / 0.4</gadget>
<output>10</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">5 * 9</gadget>
<output>45</output>

<result>45</result>