It took Xiao Ming 40 seconds to go home from the first floor to the third floor. His family lives on the eighth floor. How many more seconds?
小明回家从1楼走到3楼用了40秒，他家住在8楼，还要多少秒．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

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

<gadget id="calculator">20 * 7</gadget>
<output>140</output>

<gadget id="calculator">140 - 40</gadget>
<output>100</output>

<result>100</result>