The size of shoes is usually in "yard" or "centimeter". The conversion relationship between them is: a=2b-10, (a indicates the size, b indicates the centimeter). Grandma often wears shoes of size 36. Grandma's How long is the foot in centimeters?
鞋的尺码通常用"码"或"厘米"作单位，它们之间的换算关系是：a=2b-10，(a表示码数，b表示厘米数)奶奶经常穿36码的鞋，奶奶的脚大约长多少厘米．
<gadget id="calculator">36 + 10</gadget>
<output>46</output>

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

<result>23</result>