Lili typed a manuscript. If she typed 45 characters per minute, she could finish typing in 12 minutes. In fact, it only took 9 minutes to finish typing. How many words are typed per minute on average?
丽丽打一份稿件，如果每分钟打45个字，12分钟可以打完．实际只用了9分钟就打完了，平均每分钟打多少个字？
<gadget id="calculator">12 / 9</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">45 * (4/3)</gadget>
<output>60</output>

<result>60</result>