The ratio of basketballs to footballs is 7:5. There are 35 basketballs and how many footballs are there.
篮球与足球的个数比是7：5，篮球35个，足球有多少．
<gadget id="calculator">35 / 7</gadget>
<output>5</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<result>25</result>