The school bought 1,500 books and donated (7/10) to the disaster-stricken areas of Mount Lu. How many books are left in the school?
学校买来1500本图书，拿出(7/10)捐给庐山受灾地区，学校还剩多少本？
<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 - (7/10)</gadget>
<output>3/10 = around 0.3</output>

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

<result>450</result>