2.5*(1.9+1.9+1.9+1.9)
2.5*(1.9+1.9+1.9+1.9)
<gadget id="calculator">1.9 + 1.9 + 1.9 + 1.9</gadget>
<output>7.6</output>

<gadget id="calculator">2.5 * 7.6</gadget>
<output>19</output>

<result>19</result>