A typist typed a manuscript, typed (1/2) on the first day, typed (1/5) on the second day, and typed the entire manuscript on the second day.
打字员打一份稿件，第一天打了(1/2)，第二天打的是第一天的(1/5)，第二天打的是整份稿件的多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) * (1/5)</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>