The conversion formula between shoe size and centimeter is n=2a-10, n is the size of the shoe, and a is the centimeter of the shoe. Xiao Ming bought a pair of new shoes with a size of 23.5 cm. What is the size of Xiao Ming’s new shoes?
鞋的尺码与厘米之间的转化公式是n=2a-10，n表示鞋的尺码，a表示鞋的厘米，小明买了一双23.5厘米的新鞋，那么小明新鞋的尺码是多少．
<gadget id="calculator">2 * 23.5</gadget>
<output>47</output>

<gadget id="calculator">47 - 10</gadget>
<output>37</output>

<result>37</result>