It takes 20 days for workshop A to process a batch of garments, and 30 days for workshop B to complete. The two workshops work at the same time for 5 days. Workshop A makes 120 more sets than workshop B. How many sets of clothes are in this batch?
加工一批服装，甲车间要20天完成，乙车间要30天完成，两个车间同时做了5天，甲车间比乙车间多做了120套．这批服装是多少套？
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) * 5</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(1/30) * 5</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/4) - (1/6)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">120 / (1/12)</gadget>
<output>1_440</output>

<result>1_440</result>