Two groups assemble radios. Group A assembles 50 radios every day, and completes 10% of the total task on the first day. At this time, group B starts to assemble, and assembles 40 radios every day. How many days did Group A work to complete this batch of tasks?
两个小组装配收音机，甲组每天装配50台，第一天完成了总任务的10%，这时乙组才开始装配，每天装配40台，完成这批任务时，甲组做了多少天？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">50 / (1/10)</gadget>
<output>500</output>

<gadget id="calculator">500 - 50</gadget>
<output>450</output>

<gadget id="calculator">50 + 40</gadget>
<output>90</output>

<gadget id="calculator">450 / 90</gadget>
<output>5</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<result>6</result>