The difference between the two numbers is 12.7. If the minuend is reduced by 0.9 and the subtrahend remains the same, what is the difference?
两个数的差是12.7，如果被减数减少0.9，减数不变，那么差是多少．
<gadget id="calculator">12.7 - 0.9</gadget>
<output>11.8</output>

<result>11.8</result>