Calculate 15.{_{1}**(•)}+16.{_{1}**(•)}1+17.{_{1}**(•)}+...23.{_{ 1}**(•)}=how much
计算15.{_{1}**(•)}+16.{_{1}**(•)}1+17.{_{1}**(•)}+…23.{_{1}**(•)}=多少
<gadget id="calculator">15 + 23</gadget>
<output>38</output>

<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">38 * (9/2)</gadget>
<output>171</output>

<gadget id="calculator">171 + 1</gadget>
<output>172</output>

<result>172</result>