To celebrate Children's Day on June 1st, the school bought 200 pens and 150 pencil cases to reward the safflower teenagers, spending a total of 2660 yuan. It is known that each pen is 8.5 yuan, how much is each pencil case? (solution by equation)
为庆祝"六•一"儿童节，学校买来200支钢笔和150个文具盒奖励红花少年，一共花去2660元．已知每支钢笔8.5元，每个文具盒多少元？(用方程解)
<gadget id="calculator">200 * 8.5</gadget>
<output>1_700</output>

<gadget id="calculator">2_660 - 1_700</gadget>
<output>960</output>

<gadget id="calculator">960 / 150</gadget>
<output>32/5 = around 6.4</output>

<result>32/5 = around 6.4</result>