The difference between two numbers is 15.4. If the minuend is reduced by 2 and the subtrahend remains the same, what is the difference?
两个数的差是15.4，如果被减数减少2，减数不变，那么差是多少．
<gadget id="calculator">15.4 - 2</gadget>
<output>13.4</output>

<result>13.4</result>