professional poultry farmer raises 240 geese, the number of chickens is 5/8 of that of geese, and the number of ducks is 5/6 of that of geese. How many fewer chickens are raised than ducks?
某养禽专业户养鹅240只，鸡的只数是鹅只数的(5/8)，鸭的只数是鹅的(5/6)．鸡比鸭少养多少只？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">240 * (5/6)</gadget>
<output>200</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">240 * (5/8)</gadget>
<output>150</output>

<gadget id="calculator">200 - 150</gadget>
<output>50</output>

<result>50</result>