There are 280 cattle on the farm. The number of sheep is cattle (3/4) and horses (7/10). How many horses are there on the farm?
农场有牛280头，羊的只数是牛的(3/4)，又是马的(7/10)，农场养马多少只．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">(3/4) / (7/10)</gadget>
<output>15/14 = around 1.071429</output>

<gadget id="calculator">280 * (15/14)</gadget>
<output>300</output>

<result>300</result>