There are 35 balls and footballs, and the ratio of the number of balls to footballs is 5:2. How many more balls are there than soccer balls?
皮球和足球一共有35个，皮球和足球个数的比是5：2．皮球比足球多多少个？
<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">35 * (5/7)</gadget>
<output>25</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">35 * (2/7)</gadget>
<output>10</output>

<gadget id="calculator">25 - 10</gadget>
<output>15</output>

<result>15</result>