The bookstore shipped a children's storybook. It was sold on the first day (3/10), and on the second day it was sold on the first day (6/5). It is known that 30 more books were sold on the second day than on the first day. , How many such storybooks are there in total from the bookstore?
书店运来一种儿童故事书，第一天卖了(3/10)，第二天卖的是第一天的(6/5)，已知第二天比第一天多卖了30本，书店运来的这种故事书一共有多少本？
<gadget id="calculator">6 / 5</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(6/5) - 1</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">30 / (1/5) / (3/10)</gadget>
<output>500</output>

<result>500</result>