Aunt Li’s family raises 40 geese, and the number of geese is equal to that of ducks (4/5), so how many ducks does Aunt Li raise.
李阿姨家养鹅40只，养鹅的只数是鸭的(4/5)，则李阿姨家养鸭多少只．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">40 / (4/5)</gadget>
<output>50</output>

<result>50</result>