If the minuend increases by 5.4 and the subtrahend remains the same, how much does their difference increase
如果被减数增加5.4，减数不变，那么它们的差增加多少
<gadget id="calculator">10 + 5.4</gadget>
<output>15.4</output>

<gadget id="calculator">10 - 5</gadget>
<output>5</output>

<gadget id="calculator">15.4 - 5</gadget>
<output>10.4</output>

<gadget id="calculator">10.4 - 5</gadget>
<output>5.4</output>

<result>5.4</result>