There are 1,500 books in the school library. (2/5) of the total number was borrowed in the first week, and (3/10) of the total number was borrowed in the second week. How many books are left in the library?
学校图书馆有图书1500本，第一周借出去总数的(2/5)，第二周借出去总数的(3/10)，图书馆还剩多少本图书没借？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">1 - (2/5) - (3/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1_500 * (3/10)</gadget>
<output>450</output>

<result>450</result>