The size of the shoes we wear is usually in "yard" or "centimeter". The conversion relationship between them is b=2a-10 (a means centimeter, b means size).
我们穿的鞋尺码通常用"码"或"厘米"做单位，它们之间的换算关系是b=2a-10(a表示厘米，b表示码)36码的鞋长多少厘米．
<gadget id="calculator">36 + 10</gadget>
<output>46</output>

<gadget id="calculator">46 / 2</gadget>
<output>23</output>

<result>23</result>