There are a total of 200 parts in a batch. After inspection, the unqualified ones account for the qualified ones (1/9). How many qualified parts are there?
一批零件共有200个，经检验，不合格的占合格的(1/9)．合格的零件有几个？
<gadget id="calculator">1 + 9</gadget>
<output>10</output>

<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">200 * (9/10)</gadget>
<output>180</output>

<result>180</result>