Three boxes of volleyballs cost 840 yuan in total, 10 in each box, how much is each? (answer in two ways)
三箱排球共840元，每箱10个，每个多少元？(用两种方法解答)
<gadget id="calculator">840 / 3 / 10</gadget>
<output>28</output>

<result>28</result>