3 times x plus 2.5 times x is 13.2.
x的3倍加上x的2.5倍，和是13.2．
<gadget id="calculator">3 + 2.5</gadget>
<output>5.5</output>

<gadget id="calculator">13.2 / 5.5</gadget>
<output>2.4</output>

<result>2.4</result>