The school bought 40 pots of chrysanthemums, and put them in 6 classrooms, with an average of 6 pots in each classroom, and put the rest in the office. How many pots of chrysanthemums are there in the office?
学校买了40盆菊花，先放在6个教室，平均每个教室放6盆，剩下的放在办公室里，办公室里放多少盆菊花？
<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">40 - 36</gadget>
<output>4</output>

<result>4</result>