A typist typed a manuscript, typed 16 pages a day, and completed it in 15 days. If it takes 12 days to complete, how many pages do you need to type every day? (answer with ratio)
一位打字员打一份书稿，每天打16页，15天完成．如果要12天完成，每天需要打多少页？(用比例解答)
<gadget id="calculator">16 * 15</gadget>
<output>240</output>

<gadget id="calculator">240 / 12</gadget>
<output>20</output>

<result>20</result>