Obviously typed a 16,000-word manuscript, typed (1/4) of the total on the first day, and typed the rest (2/5) on the second day. How many words did you type the next day?
明明打一份16000字的稿件，第一天打了总数的(1/4)，第二天打了余下的(2/5)．第二天打了多少个字？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">16_000 * (1/4)</gadget>
<output>4_000</output>

<gadget id="calculator">16_000 - 4_000</gadget>
<output>12_000</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">12_000 * (2/5)</gadget>
<output>4_800</output>

<result>4_800</result>