The size of the shoes we wear is usually in "yard" or "centimeter", and the conversion relationship between them is b=2a-10 (b indicates the number of yards, a indicates the number of centimeters). Congcong wears size 38 shoes, how many centimeters is the unit of centimeters?
我们所穿鞋的尺码通常用"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)．聪聪穿38码的鞋，用厘米作单位就是多少厘米．
<gadget id="calculator">38 + 10</gadget>
<output>48</output>

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

<result>24</result>