To celebrate New Year's Day, our school prepared some balloons to decorate the classrooms and distributed them to 11 classes, each class has 105 balloons. The school still needs to keep 50 spares. How many balloons should the school buy?
庆元旦，我校准备了一些气球布置教室，发给11个班，每班105个，学校还需要留50个备用，学校应买多少个气球？
<gadget id="calculator">105 * 11</gadget>
<output>1_155</output>

<gadget id="calculator">1_155 + 50</gadget>
<output>1_205</output>

<result>1_205</result>