2 times a number is 1.9 more than 1.5 times it, what is this number?
一个数的2倍比它的1.5倍多1.9，这个数是多少？
<gadget id="calculator">2 - 1.5</gadget>
<output>0.5</output>

<gadget id="calculator">1.9 / 0.5</gadget>
<output>3.8</output>

<result>3.8</result>