Processing a batch of parts, A and B cooperate to complete it in 15 days. If A makes 5 days and B makes 3 days, all (7/30) can be completed. It is known that A makes 18 parts every day. How many of these parts are there in total?
加工一批零件，甲、乙合作15天完成，如果甲做5天，乙做3天，可完成全部的(7/30)，已知甲每天做18个，这些零件共有多少个？
<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>