Uncle Zhang’s family raised 200 geese, and the number of geese was less than that of ducks (3/5). How many ducks did they raise? (solution by equation)
张大爷家养了200只鹅，鹅的只数比鸭少(3/5)，养了多少只鸭？(用方程解)
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">200 / (2/5)</gadget>
<output>500</output>

<result>500</result>