To process a batch of garments, it was originally planned to process 180 pieces per day, which can be completed in 20 days. Now it is required to be completed in 15 days. How many more pieces are processed per day on average?
加工一批服装，原计划每天加工180件，20天可以完成，现在要求15天完成，平均每天多加工多少件？
<gadget id="calculator">20 / 15</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">180 * (4/3)</gadget>
<output>240</output>

<gadget id="calculator">240 - 180</gadget>
<output>60</output>

<result>60</result>