It takes 20 minutes for a typist to print a manuscript at a speed of 120 words per minute. If you want to advance 5 minutes, how many words do you need to type per minute?
一位打字员以每分钟打120个字的速度打印一份稿件需20分钟完成．如果想提前5分钟，每分钟需打多少个字？
<gadget id="calculator">20 - 5</gadget>
<output>15</output>

<gadget id="calculator">20 / 15</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">120 * (4/3)</gadget>
<output>160</output>

<result>160</result>