The number of chickens raised by a professional household is geese (2/5) and ducks (6/7). There are 480 geese and how many ducks are raised?
一个专业户养鸡的只数是鹅的(2/5)，是鸭的(6/7)，养鹅480只，养鸭多少只？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">(2/5) / (6/7)</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">480 * (7/15)</gadget>
<output>224</output>

<result>224</result>