The size of shoes is usually in "yard" or "centimeter". The conversion relationship between them is: b=2a-10 (b indicates the size, a indicates the centimeter). Xiaoming's foot length is 22 centimeters this year. He wants What size shoes do you wear?
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)小明今年的脚长为22厘米，他要穿多少码的鞋．
<gadget id="calculator">2 * 22</gadget>
<output>44</output>

<gadget id="calculator">44 - 10</gadget>
<output>34</output>

<result>34</result>