rope is 100 decimeters long, 3 meters are used for the first time, and 40 decimeters are used for the second time, how many meters are left?
一根绳子长100分米，第一次用去3米，第二次用去40分米，还剩多少米？
<gadget id="calculator">100 / 10</gadget>
<output>10</output>

<gadget id="calculator">40 / 10</gadget>
<output>4</output>

<gadget id="calculator">10 - 3 - 4</gadget>
<output>3</output>

<result>3</result>