story book has 126 pages, and the ratio of the number of read pages to the number of unread pages is 4:5. How many pages are left in this story book?
一本故事书有126页，已看页数与未看页数的比是4：5，这本故事书还剩多少页没看？
<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">126 * (5/9)</gadget>
<output>70</output>

<result>70</result>