Uncle Zhang raised 500 ducks and geese in total, of which ducks accounted for 60%. How many ducks did he raise?
张大爷家养鸭、鹅共500只，其中鸭占60%，养了多少只鸭？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">500 * (3/5)</gadget>
<output>300</output>

<result>300</result>