If a typist types a manuscript, if he types 18 pages a day, he can finish typing in 15 days. If you type 27 pages a day, how many days can you finish this manuscript? (Solve with ratio)
一位打字员打一本书稿，如果每天打18页，15天可以打完．若每天打27页，几天能打完这本书稿？(用比例解)
<gadget id="calculator">18 * 15</gadget>
<output>270</output>

<gadget id="calculator">270 / 27</gadget>
<output>10</output>

<result>10</result>