A 1 meter long sugar cane eats 3 decimeters, how many centimeters are left?
一根1米长的甘蔗吃了3分米，还剩多少厘米．
<gadget id="calculator">1 * 100</gadget>
<output>100</output>

<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<gadget id="calculator">100 - 30</gadget>
<output>70</output>

<result>70</result>