One goose can be exchanged for 2 ducks, 3 ducks can be exchanged for 5 chickens, and 6 geese can be exchanged for how many chickens.
一只鹅能换2只鸭，3只鸭能换5只鸡，6只鹅可以换多少只鸡．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">6 * (2/3) * 5</gadget>
<output>20</output>

<result>20</result>