Uncle Wang’s family has 20 geese, and the number of ducks is five times that of geese. How many more ducks are there than geese?
王大伯家养了20只鹅，养鸭的只数是鹅的5倍，养的鸭比鹅多多少只？
<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">100 - 20</gadget>
<output>80</output>

<result>80</result>