A new batch of popular science books arrives at the bookstore. On the first day, 2/5 of the total number are sold, and 45 copies are sold on the second day. How many books are there in total?
书店新到一批科普读物，第一天卖出总数的(2/5)，第二天卖出了45本，这时卖出的比剩下的多(2/3)，这批科普书物共有多少本？
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(5/8) - (2/5)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">45 / (9/40)</gadget>
<output>200</output>

<result>200</result>