2%x*15+(1/2)=11.
2%x*15+(1/2)=11．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">11 - (1/2)</gadget>
<output>21/2 = around 10.5</output>

<gadget id="calculator">(21/2) / 0.3</gadget>
<output>35</output>

<result>35</result>