When X=11.5, 3X+1.2=how much.
当X=11.5时，3X+1.2=多少．
<gadget id="calculator">3 * 11.5</gadget>
<output>34.5</output>

<gadget id="calculator">34.5 + 1.2</gadget>
<output>35.7</output>

<result>35.7</result>