The assembly workshop assembles a batch of machine tools. It was originally planned to assemble 52 machines per day, which took 15 days to complete. After improving the process, it actually took only 12 days to complete the task. How many machines are actually assembled every day compared to the original plan?
装配车间装配一批机床，原计划每天装配52台，15天完成，改进工艺后，实际只用了12天完成任务，实际每天比原计划每天多装配多少台？
<gadget id="calculator">15 / 12</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">52 * (5/4)</gadget>
<output>65</output>

<gadget id="calculator">65 - 52</gadget>
<output>13</output>

<result>13</result>