It costs 168 yuan to buy 3 footballs, and 264 yuan to buy 4 basketballs. How much is each football cheaper than a basketball?
买3个足球共花了168元，买4个篮球共花了264元，每个足球比篮球便宜多少钱？
<gadget id="calculator">264 / 4</gadget>
<output>66</output>

<gadget id="calculator">168 / 3</gadget>
<output>56</output>

<gadget id="calculator">66 - 56</gadget>
<output>10</output>

<result>10</result>