There are 150 wild ducks and 100 swans in Cuihu Park. The number of wild ducks and swans accounts for 5/7 of the total number of birds in the park. How many birds are there in the park?
翠湖公园里有150只野鸭和100只天鹅，野鸭和天鹅的数量占公园里鸟类总数的(5/7)，公园里一共有鸟类多少只？
<gadget id="calculator">150 + 100</gadget>
<output>250</output>

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

<gadget id="calculator">250 / (5/7)</gadget>
<output>350</output>

<result>350</result>