There are 400 cattle in the livestock farm. The number of sheep is cattle (7/8) and horses (7/10). How many horses are there in the livestock farm?
畜牧场养牛400头，羊的只数是牛的(7/8)，是马的(7/10)，畜牧场养马多少匹？
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(7/8) / (7/10)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">400 * (5/4)</gadget>
<output>500</output>

<result>500</result>