The grain store brings in a batch of rice, sells 1/5 of the total number on the first day, and sells 15 bags less than the first day on the second day. At this time, the ratio of the number of bags sold to the remaining bags is 3:5. How many bags are there in this batch of rice?
粮店运进一批大米，第一天卖出总数的(1/5)，第二天比第一天少卖15袋，这时卖出的与剩下的袋数比是3：5，这批大米共有多少袋？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(3/8) - (1/5)</gadget>
<output>7/40 = around 0.175</output>

<gadget id="calculator">(1/5) - (7/40)</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">15 / (1/40)</gadget>
<output>600</output>

<result>600</result>