The farm raises 120 roosters and 180 hens, and the chickens raised are ducks (5/4). How many ducks do you have?
饲养场养了120只公鸡，180只母鸡，养的鸡是鸭的(5/4)．养鸭多少只？
<gadget id="calculator">120 + 180</gadget>
<output>300</output>

<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">300 / (5/4)</gadget>
<output>240</output>

<result>240</result>