There are 9 basketballs in the school, and the number of footballs is 4 times that of basketballs. How many footballs are there?
学校有篮球9个，足球的个数是篮球的4倍，足球有多少个？
<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<result>36</result>