Master Li processes 180 parts, 30 on the first day, and the rest (2/5) on the second day, how many parts are left?
李师傅加工180个零件，第一天做了30个，第二天做了余下的(2/5)，还余下多少个零件？
<gadget id="calculator">180 - 30</gadget>
<output>150</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">150 * (3/5)</gadget>
<output>90</output>

<result>90</result>