If one addend is decreased by 0.7, how much should the other addend be increased if the sum is to be increased by 8.5
一个加数减少0.7，如果要使和增加8.5，另一个加数应增加多少
<gadget id="calculator">8.5 + 0.7</gadget>
<output>9.2</output>

<result>9.2</result>