A batch of parts is produced, 180 are produced on the first day, 30 less than (1/4) of the total are produced on the second day, and (1/3) of the total is produced in two days. How many parts are there in this batch?
生产一批零件，第一天生产了180个，第二天生产的比总数的(1/4)少30个，两天共生产了总数的(1/3)．这批零件共有多少个？
<gadget id="calculator">180 - 30</gadget>
<output>150</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/3) - (1/4)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">150 / (1/12)</gadget>
<output>1_800</output>

<result>1_800</result>