The school plans to distribute exercise books to 12 classes, with 136 books per class. There are still 50 spare books, how many exercise books should the school buy?
学校准备给12个班发练习本，每班136本．还要留50本备用，学校应买多少本练习本？
<gadget id="calculator">136 * 12</gadget>
<output>1_632</output>

<gadget id="calculator">1_632 + 50</gadget>
<output>1_682</output>

<result>1_682</result>