A basketball is 56.6 yuan, a football is 24.8 yuan, the school teacher Zhang brought 400 yuan, first bought 4 basketballs, and the rest money to buy footballs, how many footballs can you buy?
一只篮球56.6元，一只足球24.8元，学校张老师带了400元，先买了4只篮球，剩下的钱买足球，还能买多少只足球？
<gadget id="calculator">56.6 * 4</gadget>
<output>226.4</output>

<gadget id="calculator">400 - 226.4</gadget>
<output>173.6</output>

<gadget id="calculator">173.6 / 24.8</gadget>
<output>7</output>

<result>7</result>