Xiaoli bought 2 pens and 5 pencil cases at the stationery store, and the total cost was 75 yuan. Knowing that a pen is 5 yuan, how much is a pencil case? (Solution of column equation)
小力在文具店买了2支钢笔和5个文具盒，共用去75元，已知一支钢笔5元，求一个文具盒多少元？(列方程解)
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">75 - 10</gadget>
<output>65</output>

<gadget id="calculator">65 / 5</gadget>
<output>13</output>

<result>13</result>