The sum of the minuend, subtrahend and difference of a subtraction formula is 336, and the subtrahend is half of the difference. If the minuend remains unchanged and the difference increases by 28, what should the subtrahend become.
一个减法算式的被减数、减数、差相加得336，减数是差的一半，如果被减数不变，差增加28，减数应变为多少．
<gadget id="calculator">336 / 2</gadget>
<output>168</output>

<gadget id="calculator">168 - 84</gadget>
<output>84</output>

<result>84</result>