Xiao Ming's family has 9 chickens and some rabbits. The rabbits have 10 more legs than the chickens. Do you know how many rabbits his family has?
小明家养了9只鸡，还养了一些兔，兔的腿比鸡的腿多10只，你知道他家养了多少只兔吗？
<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<gadget id="calculator">18 + 10</gadget>
<output>28</output>

<gadget id="calculator">28 / 4</gadget>
<output>7</output>

<result>7</result>