Teacher Li distributes exercise books to 15 classes in the school. Each class is divided into 150 books, and 40 books are left as spares. How many exercise books did the school buy in total?
李老师给全校15个班级分发练习本，每个班分150本，还剩40本做为备用．学校一共买来多少本练习本？
<gadget id="calculator">15 * 150</gadget>
<output>2_250</output>

<gadget id="calculator">2_250 + 40</gadget>
<output>2_290</output>

<result>2_290</result>