A and B buy a basket of apples together, A buys (2/7) more 8.4 kilograms, and B buys exactly half of it, how many kilograms are there in this basket of apples?
甲、乙两人合买一筐苹果，甲买了其中的(2/7)还多8.4千克，乙正好买了其中的一半，这筐苹果一共有多少千克？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (1/2) - (2/7)</gadget>
<output>3/14 = around 0.214286</output>

<gadget id="calculator">8.4 / (3/14)</gadget>
<output>39.2</output>

<result>39.2</result>