Xiaoying borrows a book. If she reads 18 pages a day, she can finish it in 15 days. Now she finishes reading it 5 days ahead of schedule. How many pages should she read every day? (Solve with ratio)
小英借来一本书，如果每天读18页，15天可以读完，现在提前5天读完，每天应读多少页？(用比例解)
<gadget id="calculator">18 * 15</gadget>
<output>270</output>

<gadget id="calculator">15 - 5</gadget>
<output>10</output>

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

<result>27</result>