The size of shoes is usually in "yard" or "centimeter", and the conversion relationship between them is b=2a-10 (b indicates the size, a indicates the centimeter), if Xiao Ming's shoes are 38 yards, the actual How many centimeters is it?
鞋的尺码通常用"码"或"厘米"作单位，它们之间的换算关系是b=2a-10(b表示码数，a表示厘米数)，如果小明所穿的鞋是38码，实际是多少厘米．
<gadget id="calculator">38 + 10</gadget>
<output>48</output>

<gadget id="calculator">48 / 2</gadget>
<output>24</output>

<result>24</result>