The sum of three numbers is 10, two of the addends are 4.8, what is the third addend
三个数的和是10，其中两个加数都是4.8，第三个加数是多少
<gadget id="calculator">4.8 * 2</gadget>
<output>9.6</output>

<gadget id="calculator">10 - 9.6</gadget>
<output>0.4</output>

<result>0.4</result>