To process a batch of parts, A and B work together in 15 days to complete. If A works for 3 days and B works for 5 days, all tasks can be completed (7/30). It is known that B makes 18 parts every day, how many parts are there in this batch?
加工一批零件，甲、乙合做15天完成．如果甲做3天，乙做5天，可完成全部任务的(7/30)．已知乙每天做18个，这批零件共有多少个？
<gadget id="calculator">7 / 30</gadget>
<output>7/30 = around 0.233333</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/15) * 3</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(7/30) - (1/5)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">(1/30) / 2</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">18 / (1/60)</gadget>
<output>1_080</output>

<result>1_080</result>