Xiaoxiao did a seed germination test. 485 seeds germinated, and the germination rate was 97%. Do you know how many seeds Xiaoxiao used for the test?
笑笑做种子发芽试验，有485粒种子发芽，种子发芽率是97%，你知道笑笑用多少粒种子做试验吗？
<gadget id="calculator">97 / 100</gadget>
<output>97/100 = around 0.97</output>

<gadget id="calculator">485 / (97/100)</gadget>
<output>500</output>

<result>500</result>