8.3 is 3.7 less than 2.5 times of a number, what is this number?
8.3比一个数的2.5倍少3.7，这个数是多少．
<gadget id="calculator">8.3 + 3.7</gadget>
<output>12</output>

<gadget id="calculator">12 / 2.5</gadget>
<output>4.8</output>

<result>4.8</result>