The school bought 2,000 exercise books and distributed them to 16 classes. Each class has 120 books. How many books are left?
学校买来2000本练习本，分给16个班，每班120本，还剩多少本？
<gadget id="calculator">16 * 120</gadget>
<output>1_920</output>

<gadget id="calculator">2_000 - 1_920</gadget>
<output>80</output>

<result>80</result>