There is 200kg of rice in the cafeteria, use up (7/10), how many kilograms are left.
食堂有200kg大米，用去(7/10)，还剩多少kg．
<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 - (7/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">200 * (3/10)</gadget>
<output>60</output>

<result>60</result>