For a batch of parts, the ratio of the number of processed parts to the number of unprocessed parts is 1:3, and 150 more parts are processed, and the ratio of the number of processed parts to the number of unprocessed parts is 2:3, then this batch How many parts are there in total?
一批零件，已经加工的个数与未加工的个数之比是1：3，再加工150个，已加工的零件个数与未加工的零件个数之比为2：3，则这批零件一共有多少个？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">(2/5) - (1/4)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">150 / (3/20)</gadget>
<output>1_000</output>

<result>1_000</result>