When reading a book, the ratio of the number of pages read to the number of unread pages is 4:3, 120 pages have been read, and how many pages are left unread.
读一本书，已读页数与未读页数的比是4：3，已读了120页，还有多少页没读．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">120 * (3/4)</gadget>
<output>90</output>

<result>90</result>