There are only 4 masters and 16 apprentices in a certain factory, how much do the number of masters account for the total number of people in the factory?
某工厂只有4名师傅和16名徒弟，师傅人数占工厂总人数的多少．
<gadget id="calculator">4 + 16</gadget>
<output>20</output>

<gadget id="calculator">4 / 20</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>