A chemical plant produces 27 tons of industrial sewage every day, of which (9/10) has been treated, how many tons of untreated sewage?
某化工厂每天产生27吨的工业污水，其中有(9/10)经过处理，未经处理的污水有多少吨？
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">27 * (1/10)</gadget>
<output>27/10 = around 2.7</output>

<result>27/10 = around 2.7</result>