The average of three numbers is 84, one of which is 96, which is 1.2 times the other number, then what is the third number.
三个数的平均数是84，其中一个数是96，它是另一个数的1.2倍，那么第三个数是多少．
<gadget id="calculator">84 * 3</gadget>
<output>252</output>

<gadget id="calculator">96 * 1.2</gadget>
<output>115.2</output>

<gadget id="calculator">252 - 96 - 115.2</gadget>
<output>40.8</output>

<result>40.8</result>