There are 280 female workers in Xingda Toy Factory, and the number of male workers is half of the number of female workers. How many male and female workers are there altogether?
兴达玩具厂有女工280人，男工人数是女工人数的一半．男、女工一共有多少人？
<gadget id="calculator">280 / 2</gadget>
<output>140</output>

<gadget id="calculator">140 + 280</gadget>
<output>420</output>

<result>420</result>