To celebrate Children's Day on June 1st, the school bought 200 pens and some pencil cases to reward the safflower teenagers, and spent a total of 2,600 yuan. It is known that each pen is 7 yuan and each pencil case is 8 yuan. How many pencil boxes did the school buy?
为庆祝"六•一"儿童节，学校买来200支钢笔和部分文具盒奖励红花少年，一共花去2600元．已知每支钢笔7元，每个文具盒8元，学校买了多少个文具盒？
<gadget id="calculator">7 * 200</gadget>
<output>1_400</output>

<gadget id="calculator">2_600 - 1_400</gadget>
<output>1_200</output>

<gadget id="calculator">1_200 / 8</gadget>
<output>150</output>

<result>150</result>