When two numbers are subtracted, the minuend is reduced by 9, and to increase the difference by 5, how should the subtrahend change: how much.
两个数相减，被减数减少9，要使差增加5，减数应怎样变化：多少．
<gadget id="calculator">9 + 5</gadget>
<output>14</output>

<result>14</result>